The perfect rack for use in microbiology and immunology labs. Made especially for use with beakers, the space-saving round bubble racks are ideal for small quantities of tubes. The racks are filled from the top and tubes are easily removed by pressing the rack down on the bench until the legs touch, releasing the tubes. Molded of buoyant polymethylpentene with tiny bubbles throughout for additional buoyancy. Tube holes are arranged in a circular pattern.