Explore your backdoor with confidence! With a small and medium plug, the Doc Johnson Crystal Jellies Anal Trainer Kit is the perfect fit for anal play beginners. The small plug is 3.5" in diameter with 3.75" insertable length, the large plug is 4.25" in diameter with 4.75" insertable length. These plugs feature a wide flared base for safe and comfortable anal play. Crystal Jellies are made from phthalate-free body safe material, which includes Doc's antibacterial Sil-A-Gel formula. Proudly made in America. 2-piece anal trainer kit. Best-selling Crystal Jellies material. Ribbed Shafts. Flared base for safe anal play.