Feature●Made of high quality silicone, can be used in plug bottles, lab vials.●Color: White●Top Diameter(big-end): 37mm / 1.45in●Bottom Diameter(small-end): 30mm / 1.18in●Height: 30mm / 1.18inDescription Silicone Stopper, Good Sealability, General purpose silicone rubber stoppers that can be used in plug bottles, lab vials.