We've all heard of (or tried out) nipple clamps, yes? They're pretty standard fare in the bondage scene. Here's something that's not necessarily standard, but will definitely, ahem, open up some new play possibilities - the Master Series Spread 'Em Poker Labia Clamp. 

The Pussy Clamp was designed to fit over the outer labia or lips, with an edge tucking away below, and the other, spiky side framing the entire vulva. Once in position, you or they will be able to increase or decrease pressure on the outer edge, pinching or spreading the outer labia. 

In iron and zinc alloy (nickel free), the Spread 'Em Poker is easy to clean with simple soap and water, and warms to body heat almost immediately. Pop it in the fridge or some heated water to play with temperature more dramatically. 

* The innermost opening is 3.75"/9.5cm long and 1.1"/2.8cm in diameter. Clamp opens to .6"/1.5cm on either side.