Actually when I dive "wet" I do not use the "V" weight. It is only when I am my dry suit, diving AL doubles that I need a few lbs. The "V" weights are for a double tank set up, hence the attaching them on the bands, between the tanks. There is NO movement at all!! These weights can be custom made for any weight, but can be purchased in 8, 11, 15 lbs. "V's". The whole point of these weights is for the diver to be diving a balanced rig.