Perfect for beginner bondage play. Caution: being handcuffed can be a deeply erotic experience for both of you. Product specifications: release keys included, but not necessary for quick release. Quick release lever for peace of mind. Minimum internal cuff circumference measures 5 inches. Maximum internal cuff circumference measures 7.5 inches. Materials 100% nickel free metal. Includes one pair of Ring Metal Handcuffs.