Durable black gum rubber 2-hole stoppers are the perfect addition to your laboratory or scientific experiments. These stoppers come with two holes to accommodate various sizes of laboratory glassware, ensuring a secure and leakproof seal. Each stopper is equipped with a raised figure on top, making it easy to identify the size for quick and efficient use. Made from high-quality black gum rubber, these stoppers are resilient and long-lasting, able to withstand a variety of laboratory conditions. Whether you're conducting experiments or storing chemicals, our 2-hole stoppers are an essential tool for any scientific environment.