These long-lasting Rubber Stoppers are made from excellent grade rubber with a low sulfur content and are used to close or seal test tubes. They are no. 6 stoppers that measure 23x23x17mm and are suitable for use with glass or plastic test tubes and Erlenmeyer flasks. These stoppers come in a handy pack of 10 and are ideal for use in the science classroom or laboratory.
•Long-lasting no.6 rubber stoppers
•Made from excellent grade rubber with low sulfur content
•Suitable for use with glass or plastic test tubes and Erlenmeyer flasks
•Comes in a pack of 10