Ornament Adjustable Nipple Clamps with Jewel Accents Square Clear. This sparkling set of rhinestone adorned nipple clamps will give you a dazzling way to make sure their eyes stay on you! The cube shaped embellishments are set on all sides with clear sparkling gems which catch the light with every movement. The clamps themselves are vinyl coated. with a thumb screw that allows you to adjust the tightness as you need it. The adjustable pressure make them ideal for all experience levels. Measurements: 4.5 inches in total length. opens to 0.5 inch wide. Materials metal. rubber. glass. Color Clear