With a small and medium plug, the Crystal Jellies Anal Trainer Kit is the perfect fit for anal play beginners. The small plug is 3.5 in. in diameter with 3.75 in. insertable length, the large plug is 4.25 in. in diameter with 4.75 in. insertable length. These plugs feature a wide flared base for safe and comfortable anal play. Crystal Jellies are made from non-phthalate body safe material, which includes the antibacterial Sil-A-Gel formula.