Feature●The raw material of it is premium silicone and it can be used in plug bottles, lab vials.●Color: White●Bottom Diameter(small-end): 40mm / 1.57in●Top Diameter(big-end): 50mm / 1.97in●Height: 37.5mm / 1.47inDescription Silicone Stopper, Good Seal ability, General purpose silicone rubber stoppers that can be used in plug bottles, lab vials.