Description The Test Tube Stopper Rubber Plug is designed to withstand high temperatures and is perfect for various experimental needs. Its design ensures fit, while the material provides sealing, you will have an abundant supply for your experiments. Additionally, this set includes multiple sizes, making it suitable for different test tubes and flasks. Features -Color:White -Material:Rubber -Size:2.90X2.80X2.00cm/1.14X1.10X0.79in -Size:2.70X1.90X1.50cm/1.06X0.75X0.59in -Size:2.40X1.80X1.30cm/0.94X0.71X0.51in -Size:2.00X1.70X1.20cm/0.79X0.67X0.47in -Size:1.80X1.40X1.00cm/0.71X0.55X0.39in -These rubber stoppers are perfect for any laboratory various needs. -The rubber stopper ensures the sealing conditions of the experiment, making the experiment effective. -Theserubber plugs can be used to plug glass ports, fish tank openings, etc. -With a wide range of sizes, these rubber stoppers are compatible with a variety of equipment and can be used in a variety of experiments. -Made of rubber, these plugs are portable, making them great for any laboratory.Package list: 50 x Rubber Stoppers(5 sizes)