Description These black tapered rubber stoppers are designed for laboratory use, providing a secure seal for various containers. Made from solid rubber, they ensure durability and a tight fit, preventing leaks. Ideal for sealing experimental bottles, these stoppers are essential for maintaining the integrity of your lab work. Features -Color:Black -Material:Rubber -Size:4.20X3.00X3.00cm/1.65X1.18X1.18in (max) -Size:1.80X1.40X0.90cm/0.71X0.55X0.35in (min) -Easy to use: simply push the stopper into the desired opening for an instant leakproof seal, making it convenient for various laboratory applications -High sealing performance: effectively prevents reagent evaporation, ensuring experimental stability and accuracy in your lab work -great material: made from robust rubber, these stoppers are suitable for various experimental environments, extending the lifespan of your lab equipment -Tapered design: fits a wide range of laboratory containers, enhancing operational efficiency and versatility in your experiments -Reliable sealing solution: solid rubber stoppers provide dependable sealing for laboratory setups, pipelines, tanks, and bottlesPackage list: 11 x Laboratory Rubber Plug (11 sizes)