Chained Nipple Grippers
Don't be deceived by the green clamps in this set; they certainly have a bite!
These medical tube clamps grip onto the nipples tightly and are harshly unforgiving.
Easy to operate (even with slippery fingers), these scissor-like clamps can be locked in two different positions: hard and harder!
Also ideal for intense cock and ball play, not just on the nipples!