These body-heat holding silicone plugs are deliciously designed with two large ripples for double the fun. A long, flat rectangular base offers plenty of control. The small Severin is approximately 1.5 inches in diameter and 4.5 inches long. The medium Severin is approximately 2 inches in diameter and 4.75 inches long. The large Severin is approximately 2.5 inches in diameter and 6 inches long. Cleaning and Care: Unlike Jelly or Rubber, Silicone products are hypo-allergenic, phthalate-free, and nonporous (which means bacteria cannot hide inside) and can be sterilized by dipping in boiling water for 2-3 minutes or cycled in the top shelf of a dishwasher! For every day clean-up, wash with anti-bacterial soap and warm water.