Atomik Climbing Holds Training 3.5" Bombs - Perfect Climbing Balls for Building Forearm Strength - All Levels TRAINING FOR ALL LEVELS - Atomiks sets of 2 x 3.5" spherical shaped climbing bombs are great training tools meant to develop forearm muscles and strength at any level. With 4 sizes available, you are bound to find one that fits your current skill level. CAREFULLY DESIGNED - The spherical shape forces the hand into a more open-handed pinch. They range from 2.5 for beginners and little ones, to 6 for the more advanced athletes. VERSATILITY - These can be used in a variety of different style workouts. Perfect for Ninja Warrior, parkour, gymnastic, bouldering, and rock climbing athletes. Allows full shoulder rotation. SIMPLE TO USE - An excellent addition to your workout routine. Switch between pull-ups and chin-ups without ever letting go. Easy to setup and use, and its insanely fun to be on. 30-DAY RETURN POLICY - all of our products have our 30-day return policy. This means you can experience your climbing bombs completely risk-free.