These solid rubber stoppers are versatile tools for any laboratory setting. Their robust construction and tapered shape make them suitable for sealing a wide range of containers, from experimental bottles to plant culture vessels. By providing a secure seal, they help maintain the purity of your samples. 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) -Convenient usage: easily insert the stopper into any opening for a quick and effective seal, simplifying your laboratory procedures -great sealing capability: prevents the evaporation of reagents, ensuring the stability and consistency of your experimental results -Robust construction: made from great rubber, these stoppers are designed to endure various lab environments, prolonging the life of your equipment -Adaptable tapered design: the tapered shape fits a variety of lab containers, enhancing the flexibility and efficiency of your lab work -Reliable and solid: these solid rubber stoppers provide a secure sealing solution for laboratory setups, pipelines, tanks, and bottles Package list: 11 x Laboratory Rubber Plug (11 sizes)