Master Series Onus Nipple Clamps with Weights from XR Brands. When placed just so, this single alligator style clamp is designed to add graduated pressure to the sensual areas of your play thing. You decide if they deserve light pressure or an intense pinch. Onus comes to you with a rubber tipped clamp with a twist up adjuster, and 6 removable 1 ounce magnet weights. Your plaything will enjoy the customizable weight of the magnets alongside the graduated pressure. Measurements 3 inches in total length, clamp opens to approximately 0.5 inch wide. Materials Steel, Vinyl and Magnets. Color Silver. Please note sold in singles, please order 2 for a pair. No painful piercings required.