My First Nipple Clamps Pink. Wireless vibrating nipple clamps. Each clamp glows red. Easy to operate push button control. Made using phthalate free, non-toxic materials. RoHS compliant. Material used ABS plastic. Vibrating nipple clamps require 3 G13 cell batteries in each clamp, included. Nipple clamp measures 2.9375 inches long. My First Nipple Clamps Pink from Nasstoys of New York.