Borosilicate Test Tubes with Cap - 16 x 125 mm, Pack of 24These 16 x 125 mm borosilicate test tubes with caps are perfect for experiments requiring secure storage of samples. Made from clear borosilicate glass, they allow students to easily observe reactions while withstanding high heat. The included screw caps ensure contents are safely stored without contamination. How this product may be used: Conduct chemical reactions with secure storage for observation. Store liquid or solid samples for ongoing