Make the arms great again This training handball comes with rapidly spinning rotors that progresses as more spinning is being executed. It will target the forearm, wrist and hands for better grip and muscles. GIVE WRIST and FOREARM the POWER This handball aims to strengthen fingers, wrists, hands, forearms, shoulders and biceps. Basically every muscle in the hand that is needed to be enhanced or developed to have the perfect strength in playing bowling. DEVELOP FAST ARMS As the ball spins, the weight and pressure doubles and progresses giving you more window for effort and agility. FLICK and SPIN for a GREAT MUSCLE This handball needs no genius to operate. Simply flick the inside ball 3 times to give it a start and start spinning with the hand gripped by the wrist. The good thing about this exerciser is that it's portable and you can exercise anytime, anywhere. Forget the gym and exercise wrist and arms at home effectively with this UltraSpin LED Wrist Training Handball. We truly believe we make some of the most innovative products in the world, and we want to make sure we back that up with a risk-free ironclad 45 day guarantee. If you don't have a positive experience for ANY reason, we will do WHATEVER it takes to make sure you are 100% satisfied with your purchase. Buying items online can be a daunting task, so we want you to realize that there is absolute ZERO risk in buying something and trying it out. If you don't like it, no hard feelings we'll make it right. We have 24/7/365 Ticket and Email Support. Please contact us if you need assistance. Remember: Shipping usually takes 2-3 weeks read our Shipping for more details!