Thanks Ian and Oldguy. I just ordered a couple sets of these and am amazed at how much it enhances the Venus experience. Have only used on outside so far but will build another receiver soon with one of these replacing the normal constrictor. This thing really ramps up everything. I never have pop off problems either and the standard constrictor made from a piece of liner material worked just fine for me, but this thing takes it to a whole new level. The evenhanded tighter grip this delivers makes it possible to stroke anywhere on your shaft…low, high, over frenulum, wherever, and with no pop off. Can’t get enough. I’m a kid with a new toy again. I can see all kinds of other possibilities with this, like maybe using it on a head massager or in conjunction with the new stroke sleeve.