Polycarbin's 4-way flipper tube racks are perfect for sustainability-minded scientists engaging in benchtop work or cold storage. These compact, four-sided polypropylene racks are made from 100% circular economy resin and accomodate 32 x 0.5 mL tubes, 32 x 1.5-2 mL tubes, 12 x 5-15 mL tubes, and 4 x 50 mL tubes.