Locking C and B RingHard Steel for a Hard Shaft! Slide your shaft and balls into these heavy metal rings and enjoy the weight and feel of durable steel. When you want to up your cockring game, let yourself get something that will truly last the test of time! Complete with a locking mechanism and key to keep your ball ring and cock ring securely in place, this set also includes two different cock ring sizes so you can choose the one that allows for the most comfort.