Anal beads come in a variety of sizes, the most common size is 25 mm to 125 mm in diameter or larger. Anal beads are usually made of materials such as silicone, plastic, rubber, latex, glass or metal, and end with a ring or similar handle designed for pulling. The purpose of this ring is to prevent the beads from being completely retained in the rectum and easy to remove. The beads can be flexibly connected together and need to be inserted separately, or they can be connected by a semi-rigid thin shaft, allowing the anus to be inserted once. Many nerve endings of the sphincter muscle can cause arousal during insertion and extraction, and the larger beads may produce a sense of pressure when in the rectum.