Made especially for use with beakers and waterbaths, these space-saving racks are ideal for small quantities of tubes and perfect for use in microbiology and immunology labs. They are molded of buoyant TPX® brand polymethylpentene with tiny bubbles throughout for additional buoyancy. Insert tubes from the top and easily remove them by pressing the rack down on the bench. Buoyant polymethylpentene rack is ideal for incubating microtubes in a beaker of water Withstands boiling for 30 minutes at 100°C (212°F) Steam autoclavable at 121°C (250°F) Leg length: 19mm (3/4"); thickness: 6.4mm (1/4")