These Mister B Mawa Nipple Clamps are the best selling all purpose nipple clamps. With their wide openings, these clamps always do their job, regardless of the size of the nipples of the willing(less) victim. These clamps do not operate with a spring (providing constant pressure), but are closed by using the adjustment screws. This enables you to build up pressure until the wearer hits the roof. So these clamps give you the opportunity to ever increasing or renewing sensation when the wearer gets used to them, which is a feature lovers of tit torture will appreciate.