This set includes three different sizes of butt plugs. They are all made from premium hardened glass like high-end cookware and extremely durable. The crystal clear glass is non-porous and body safe. It is compatible with all personal lubricants and gets extremely slippery with just a small amount of lubricant. The pink jewel in the base gives in some nice sparkle. The largest size is 3.7 inches long overall, with an insertable length of 3.1 inches and width of 1.6 inches. The medium is 3.3 inches long overall with an insertable length of 2.7 inches long and width of 1.3 inches. The small is 2.8 inches long overall with an insertable length of 2.3 inches and a width of 1 inch.