ROCK BALL - Hand Strength Trainer

Compact power for real-rock precision.

Train like you climb — with texture, tension, and no easy angles. The Crux Gear Rock Ball builds hand, wrist, and forearm strength through real-rock feel and rotating freedom. Designed for open-hand power, pinch control, and wrist stability, it’s the compact tool that makes every session count.

Key Features:

• Real-Rock Feel – Asymmetrical dimples mimic natural rock for varied grips and progressive difficulty.
• Rotating Eye Bolt – 316-grade stainless-steel swivel reduces wrist strain and keeps movement fluid.
• Versatile Mounting – Includes short webbed strap, steel D-rings, and a 12 kN wire-gate carabiner for fast setup.
• Single or Paired Use – Train unilaterally or double up for symmetrical pull-ups and hangs.
• Compact & Travel-Ready – At just 8 cm and lightweight, it packs easily into your gear bag or the included cotton carry pouch.

Why It Works:
The Rock Ball turns simple pull-ups and grip work into climb-ready conditioning. Every surface shift challenges your fingers to adapt, building the stability, tension, and control you need on the wall.

Need a little more range? Meet the Boulder Ball — the 10 cm big brother to your Rock Ball. It brings broader pinch surfaces, two pull-up modes, and quick-switch versatility with a reversible cord. Where the Rock Ball dials in precision and finger isolation, the Boulder Ball expands your options for power, endurance, and all-angle grip training.