Reversible Microtube Racks (Blue, 60 Tube Capacity, 5/pk), Cat. No.: MTC-R1090-B, These reversible racks are designed to keep 0.5mL and 1.5mL (up to 2.0mL) microcentrifuge tubes organized and upright. Made of polypropylene, choose the blue rack for 60 tube capacity (5 rows of 12 tubes) or the larger orange rack for 96 tube capacity (8 rows of 12 tubes). Both racks have alphanumeric markings and are supplied in packs of 5.