1. APPLICATION: Centrifuge tube rack can be used to store 0.2ml, 0.5ml, 1.5ml and 2ml test tubes, perfect for school laboratory classes or professional laboratory.2. EASY REMOVAL: The Floating foam tube rack will float on the surfaces of the water, making it easy to remove samples from the bath.3. EFFECTIVE TUBE PROTECTION: The Foam tube rack ensures safe storage and prevents tubes from breaking or spilling.4. FLEXIBLE FOAM: The test tube holder is made of high density polyethylene foam that is soft and durable. The closed cell foam is resistant to water absorption and can be cleaned and reused.5. SCOPE OF APPLICATION: Foam centrifuge tube holder is brightly colored and perfect for floating tubes in a water bath, tub or beaker.Spec:Item Type: Round Foam Test Tube RackMaterial: FoamUse: For Storing 0.2ml, 0.5ml, 1.5ml and 2ml Test Tubes.Package List:5 xRound Foam Test Tube RackNote:Manual Measurement Error of 0.1 to 0.2cm