Start small and work your way up to medium and large with this quality anal training kit. It consists of 3 super smooth silicone butt plugs in different sizes, all with a flexible shaft that has small ridges to stimulate where you are most sensitive. Only use with water based lubricant. Small butt plug is 1.18 inches at is widest point. Medium butt plug is 1.57 inches at its widest point. Large butt plug is 1.96 inches at its widest point.