Specifications:High quality rubber material, non-toxic, non-irritating, corrosion resistant from acid and alkaline.Rubber plug is in chemical experiments used to seal equipment, mainly used in pharmaceutical, chemical, mechanical, and scientific research industry.Stopper or plug, is mainly used for the container or sealed glass tube perforation of the carrier. (which can be conveniently used to make holes in the diameter of each of them).Type: Rubber StopperMaterial: RubberTemperature Range: -20 ~ 100 Celsius DegreeFeatures: Non-toxic, Corrosion Resistant, Easily PerforatedSize: (Upper Diameter x Lower Diameter x Height)000 : 12.5 x 8 x 17mm00 : 15 x 11 x 20mm0 : 17 x 13 x 24mm1 : 19 x 14 x 26mm2 : 21 x 15 x 26mm3 : 23 x 17 x 26mm4 : 26 x 19 x 28mm5 : 29 x 22 x 28mm6 : 33 x 25 x 28mm7 : 37 x 29 x 30mm8 : 42 x 33 x 30mm9 : 46 x 38 x 30mm10 : 52 x 43 x 32mmNotes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:5 x Rubber Stoppers