From the front to back and back to front the Tenga Double Hole Cup Standard enjoy two different sensual sensations. A cup with two holes that allows you to enjoy different types of sensual sensations the Bitter Side and the Sweet Side. The Bitter Side firmly tightens while the Sweet Side gently clings to your penis. Normal use is one side at a time. But using both sides simultaneously transports you to the virtual world of a threesome. Double the fun with Tenga’s revolutionary Double Hole masturbator! The 2 holes have different cushions within for your pleasure – one super tight and one gently clinging. Each will give you different sensations and lead you to wholly different climaxes! These revolutionary Oncaups, named after onanism, which is another name for masturbation, are Japan’s number 1 male sex toy. The cushions of the Tenga Double Hole Onacup come with lubricant. It gets kept in a lotion reservoir where it keeps the point of insertion in a wet state. The internal canals have a diameter of 0.5 inches and a length of 5.5 inches. Each passage has a number of different nubs which give different sensations depend on which orifice is entered. The tight, or Bitter Side has 63 nubs that firmly tighten around the penis. The gentle Sweet Side has 73 nubs which cling to the penis. They are reversible to give a superb sense of adhesion as you pull out. Although designed for solo use, using both sides at the same time could transport you to a virtual threesome for extra fun! Before using your Onacup for the first time, remove the insert inside the sleeve. The lubrication consists of: purified water, glycerin, sodium polyacrylate, phenoxy ethanol, and paraben. Allergies were tested for in Japan. Please note that these products are designed for single use. Use condoms to extend usage. Tenga Double Hole Cup measures 66mm by 66mm by 155mm, bulk weight 213g Metric units or 2.5984 inches by 2.5984 inches by 6.1024 inches, bulk weight 7.5134 ounces American standard units. Tenga new adult concept be positive, be smart, be free to maximize your sexual health.