The art of glass meets the science of pleasure. Doc Johnson presents the worlds first premium vibrating glass. Designed by true artisans in Velvet Touch jewel-like pallets, they're waterproof, phthalate-free, completely hygienic and easy to clean. And because they're glass, they transfer an incredible vibration, at any of their three varying speeds. Warm them up or cool them down with hot or cold water to experience an additional boost of euphoria. Consider them a reflection of Doc Johnson's attention to detail, design and technology. 5 inches long and require 1 AA battery, (not included).