Rimless Borosilicate Test Tubes - 18 x 150 mm, Pack of 48These rimless borosilicate test tubes (18 x 150 mm) come in a pack of 48, perfect for versatile lab use where rimless designs are preferred. Made from high quality borosilicate glass, these tubes are ideal for heating, mixing, and holding substances in classroom and laboratory environments. How the product may be used: Conduct chemical reactions and observations. Use in biology for holding and mixing samples. Perform heating experiments safely. Store