Amazon.com: QFkris 2 Pack 6inch K9 Crystal Optical Glass Triangular 7 Piece Glass Prism Set in Wooden Box Scorpio Technology 20CM Optical Glass Triple Triangular Prism Physics Vicedeal Stained Glass Prism Jig: 3D Soldering Fixture for Prismatic Shapes Etsy Glass Prism, Buddha 3D Engraving(s). This slick, temperature sensitive set lets you work your way up with graduated sizes. Each plug features a tapered tip for easy insertion, and a flared base that will help keep it in place. The non porous material is hypoallergenic and safe for those with sensitivities. Phthalate free and easily sterilized, it is compatible with all lubes and will not harbor bacteria. Heat it up or cool it off with a quick dip in hot or cold water. Treat yourself to erotic bliss with Dosha Measurements: Small: 4. 5 inches in total length, 4 insertable, 1. 15 inches in diameter. Medium: 4. 75 inches in total length, 4. 5 insertable, 1. 35 inches in diameter. Large: 5. 75 inches in total length, 5 insertable, 1. 55 inches in diameter. Material: B Borosilicate Glass Color: B Clear Note: B Includes 3 anal plugs.