Test Tube Racks features: The centrifuge tube rack is for laboratory tidying your centrifuge tube. The necessary equipment for the laboratory, and your won't look so messy with it. Perfect for school, provide a clear view of the tube contents and convenient insertion and removal of tubes. Feature Color: Random color Material: Plastic Size: 16.80X9.80X4.70cm/6.60X3.85X1.85 inch Made of material for a long time and durable use It has a simple design, but very practical in use, giving you a good using experience For smaller storage requirements of microtubes or cryogenic vials for sample or case study storage. Designed for quick visual identification It is manufactured with professional technology to ensure the of the product and can work for a long time.