What is this?The Rubber Tapered Plug is great for laboratory utensils such as flasks, test tubes, or other laboratory applications, also can as a sewer plug, water pipe plug, or drain plug.What will I get?The tapered plug is in size of(Bottom.D*Top.D*H): 000#: 8 x 13 x 17 mm / 0.31 x 0.51 x 0.67 inch00#: 11 x 15 x 21 mm / 0.43 x 0.59 x 0.83 inch0#: 13 x 17 x 21 mm / 0.51 x 0.67 x 0.83 inch1#: 14 x 19 x 26 mm / 0.55 x 0.75 x 1.02 inch2#: 15 x 20 x 26 mm / 0.59 x 0.79 x 1.02 inch3#: 18 x 24 x 25 mm / 0.71 x 0.94 x 0.98 inch4#: 19 x 26 x 28 mm / 0.75 x 1.02 x 1.1 inch5#: 22 x 27 x 28 mm / 0.87 x 1.06 x 1.1 inch6#: 25 x 33 x 28 mm / 0.98 x 1.3 x 1.1 inch7#: 28 x 37 x 30 mm / 1.1 x 1.46 x 1.18 inch8#: 33 x 41 x 25 mm / 1.3 x 1.61 x 0.98 inch9#: 37 x 45 x 30 mm / 1.46 x 1.77 x 1.18 inchIn the package of: 000# x 10Pcs, 00# x 6Pcs, 0# x 3Pcs, 1# x 1Pcs, 2# x 1Pcs, 3# x 1Pcs, 4# x 1Pcs, 5# x 1Pcs, 6# x 1Pcs, 7# x 1Pcs, 8# x 1Pcs, 9# x 1Pcs(28 Pieces in Total)Are there any advantages of the product?Made of Rubber, with good resistance to chemicals, acid and alkali resistance, can withstand high temperatures in a short time.How to use it?Conical design, solid, easy to install and good sealing performance, flexible and durable, not easy to crack, shrink, harden or break.What should I notice?Please check the size carefully before ordering! This product has a smell, please put it in a ventilated place before use to reduce this smell