Adjustable up to 10.75 inches in circumference, 2 inches in diameter with superior suction comes the Hands UP! Bondage Suction Cup Cuffs. Adjustable with Velcro and made of comfortable but firm neoprene so escaping is not an option. Just stick the cup to a smooth, flat, hard surface. It is designed to hold strong. Compact, great for travel and fun for all genders!