Not only are these functional, durable and comfortable bondage cuffs. They have a heart inlay for visual decoration. The lining, on the inside of the cuffs, is made of a comfortable felt material. This allows the cuffs to feel good on the skin and not irritate (meaning you can squarely focus on the bondage play at hand and not the chaffing on the skin). They have an O-ring for connection to each other or other bondage devices.