Borosilicate Test Tubes with Cap - 25 x 150 mm, Pack of 12These 25 x 150 mm borosilicate test tubes with caps are designed for experiments that require secure storage and observation of contents. With screw caps included, they prevent contamination and are ideal for storing both liquids and solids. How this product may be used: Safely store chemical solutions and samples. Conduct reactions that need to be observed over time. Heat substances while preventing exposure to contaminants. Use in biological