These silicone rubber stoppers are designed for versatility and durability. Whether you need to seal a test tube in a lab or protect a hole during a painting or coating process. Simply insert the appropriate size plug into the opening, and it will create a secure seal. Features -Color:Assorted Color -Material:Rubber -Size:17.20X9.70X2.20cm/6.76X3.81X0.86in -Multiple applications: the 8 assorted sizes in this kit are for sealing test tubes, flasks, tanks, and bottles, offering great versatility - materials: constructed from high temp rubber and silicone rubber, these plugs are -Leakproof design: the tight fitting design of these plugs ensures that no liquids or gases escape, maintaining the safety and accuracy of your experiments -Sufficient supply: this set provides a generous supply of plugs, making it ideal for extended use in laboratories or industrial settings -User friendly: the plugs are designed for easy insertion and removal, making them convenient to use and saving you time during your experiments Package list: 1 of sealing plug (120pcs)