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 Stopper Material: Rubber Temperature Range: -20 ~ 100 Celsius Degree Features: Non-toxic, Corrosion Resistant, Easily Perforated Size: (Upper Diameter x Lower Diameter x Height) 000#: 12.5 x 8 x 17mm 00#: 15 x 11 x 20mm 0#: 17 x 13 x 24mm 1#: 19 x 14 x 26mm 2#: 21 x 15 x 26mm 3#: 23 x 17 x 26mm 4#: 26 x 19 x 28mm 5#: 29 x 22 x 28mm 6#: 33 x 25 x 28mm 7#: 37 x 29 x 30mm 8#: 42 x 33 x 30mm 9#: 46 x 38 x 30mm 10#: 52 x 43 x 32mm Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 5 x Rubber Stoppers