Our Blackout Barrel Clamps are awesome! Unlike most adjustable nipple clamps, you don’t need the dexterity of a surgeon to adjust these little pain-makers. Simply hold the base and twist. With the rubber-coated medium-tipped pinchers, you can deliver a gradual aching-pain, perfect for making those nips nice and sore. If you feel like being a bit more sadistic, pull off the rubber tips and show those nips what real endurance is all about!