IronMind CoC Silver BulletCoC Silver Bullet provides the ultimate grip strength challenge! Think your grip is strong? Prove it with the CoC Silver Bullet. Put your grip strength to the test with the IronMind CoC Silver Bullet, perfect for building endurance, power, and raw grip strength. Use the CoC Silver Bullet with your favourite Captains of Crush Hand Gripper (sold seperately) to perform the challenging Silver Bullet hold. Simply attach a 2. 5kg weight plate to the