Bullpadel
HACK JR 25
A diamond-shaped junior frame with adult-sized ambitions — built for young players who are already learning to finish points, not just keep them alive.
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Full spec breakdown
Listing checked at publish date
Highlights
What makes this racket stand out
Diamond shape at junior weight (335–345g) — the attacking geometry of the adult Hack line, scaled down for younger arm strength without softening the intent
Evalastic core cushions impact better than standard EVA, which matters at this age — it reduces the vibration load on developing arms without turning the racket mushy
Polyglass face adds a spring-effect at contact, giving juniors who don't yet generate full swing speed enough ball exit to play attacking shots from mid-court
The feel
How it's built to play, by shape, core and construction — rated low / mid / high rather than on a false 1–10 scale. Higher isn't always better; it depends on the game you want.
Balance — where the weight sits
Even
Handle / low
Head / high
The spec sheet
Weight
335–345g
Year
2025
Shape
Diamond
Level
Advanced
Style
All Around
Balance
Medium
Core
Evalastic
Face
Polyglass
Thickness (mm)
35
Our verdict
What the shape, core and construction tell us about how this racket is built to play.
The short version
The Hack JR 25 is the right racket for a junior who has outgrown beginner frames and is actively building an attacking game — the diamond geometry and Carbon Tube construction give genuine adult-racket intent at a junior-appropriate weight. The Polyglass face and Evalastic core provide enough forgiveness to make that aggressive profile learnable rather than frustrating. It is not a racket for junior beginners or players whose technique is still inconsistent — the diamond shape will expose those gaps rather than hide them.
Strengths
Junior players with 2+ years of consistent training who are developing an attacking, left-side game and need a racket that rewards that intent rather than holding them back
Young players transitioning off beginner round frames and ready to learn diagonal shape geometry — the medium balance keeps it manageable while the diamond shape starts building the right habits
Keep in mind
Junior beginners or players without consistent technique — the diamond shape concentrates the sweet spot high in the head, and mishits at this level are frequent enough to make that a real problem
How it's built to play
The Hack JR 25 is Bullpadel's attempt to give technically developing junior players a genuine piece of the adult Hack DNA rather than a junior racket that merely looks the part. At 335–345g it's on the lighter end even for a junior frame, and the diamond shape immediately signals what kind of game this racket is designed to support: one where finishing points overhead is the goal, not just getting the ball back over the net. That's an ambitious brief for a junior product — and it largely works, with one clear condition attached.
The Carbon Tube frame — 100% bidirectional carbon woven around the full perimeter — gives the Hack JR 25 a structural rigidity that most junior rackets at this price simply don't have. That stiffness means impact energy goes into the ball rather than being lost in frame flex, which is exactly what you want when a junior is practising smashes and volleys at pace. The Evalastic core is the smart counterbalance here: denser and more elastic than a soft foam but with noticeably better shock absorption than hard EVA, it cushions the contact enough to reduce vibration load on younger arms without killing the response. The Polyglass face — Bullpadel's branded fiberglass — bends slightly on contact and creates a trampoline effect that helps generate ball speed even when swing mechanics aren't fully formed yet. Together, the materials make a sensible combination: a stiff frame with a more forgiving hitting surface and a core that protects the arm while still rewarding clean strikes.
On court the diamond shape does what it always does — it pushes the sweet spot toward the top third of the face, so clean overhead contact produces noticeably more pace and kick than a round or teardrop would at the same swing speed. For a junior playing on the left side and working on bandeja and smash technique, that's a real functional advantage. The medium balance (not head-heavy like the adult Hack 04) is the key concession to the junior format: the weight stays more centred, so the racket swings faster and doesn't drag on late volleys or quick defensive exchanges. The Polyglass face means there's a small margin for error that full carbon wouldn't give — the slight flex catches off-centre hits and keeps them in play more often than a stiff carbon face would. Where this racket draws a line is at player level: a junior who mishits frequently will notice the diamond shape punishing those errors in feel and direction. The Evalastic core softens that somewhat, but it doesn't erase it.
FAQ
How does the Hack JR 25 compare to the adult Bullpadel Hack 04?
The adult Hack 04 uses TriCarbon or X-Tend Carbon faces, a MultiEVA core, and a higher balance point — it's built for players generating full adult swing speed with consistent overhead technique. The Hack JR 25 swaps those for Polyglass and Evalastic, which creates more forgiveness on the face and better vibration absorption through the core. The Carbon Tube frame and diamond shape carry across both versions, so the playing identity is similar, but the JR 25 is meaningfully more accessible at the point of contact — an important difference for a developing junior who doesn't yet produce the same impact forces as an adult competitive player.
Should a junior player choose the Hack JR 25 or a round-shape junior racket?
If the junior is in their first year of playing or still hitting inconsistently from the baseline, a round-shape junior racket is the better choice — the larger, central sweet spot is more forgiving of the mishits that happen at that stage. The Hack JR 25 makes sense once a player has consistent groundstrokes, understands court positioning, and is starting to develop attacking shots from the left side. Moving to a diamond too early can build bad habits — reaching for the top of the frame to generate power rather than learning proper swing technique.
Is the Hack JR 25 safe for a junior's arm?
The risk profile is lower than a full adult attacking racket but not negligible. The Evalastic core absorbs more vibration than hard EVA, and the Polyglass face has some flex that a carbon face wouldn't provide — both reduce transmission to the arm. The Carbon Tube frame is stiff, which means off-centre hits do produce some vibration. For a junior with no existing arm issues and sound technique, this is an acceptable setup. For any junior reporting elbow or forearm discomfort, a round-shape frame with a softer core would be a safer fit while they continue developing.
What does Evalastic actually do compared to a standard foam core?
Evalastic is a rubber-compound foam that combines density for consistent rebound with elasticity for shock absorption — it sits between soft beginner foam and hard EVA in feel and response. In practice this means the ball doesn't feel dead on slower exchanges (as a very soft foam can feel), but it also doesn't send vibration straight into the wrist the way a hard EVA core does. For a junior playing extended training sessions, that cushioning across repeated contacts is a meaningful advantage over cheaper foam cores that compress and lose their properties after a season of heavy use.
Does the Hack JR 25 have a smaller grip than an adult racket?
Bullpadel's junior rackets typically use a grip circumference sized for smaller hands — if you're a junior with larger hands or an adult considering this frame for its lighter weight, it's worth checking the grip circumference before purchasing. A grip that's too small increases the tendency to over-grip, which adds tension to the forearm and raises injury risk. If the grip feels narrow, a replacement overgrip or two wraps of a thicker grip tape will bring it to a comfortable size.
Made for elbow-conscious players.
A diamond-shaped junior frame with adult-sized ambitions — built for young players who are already learning to finish points, not just keep them alive.
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