I have tried 3-4 different types made of steel (all from Steelworksextreme.com, see his homepage), the Tube, CB3000 and one made of “soft plastic”. All others than Penicap failed miserably in the basic function. All could be taken off without unlocking the system. So if not turning to a full-type belt, in my view Penicap is the most efficient (secure), most comfortably to wear and least visible of all “non-belt” types of chastity devices… and I have been trying out a few as you can see :o) I am a big fan of Penicap.