1、WASHABLE: The closed cell foam is anti absorbent and can be washed and reused without damaging the tubes. 2、FLOATING: Foam tube holders will float on the surfaces of the water, making it easy to remove samples from the bath, perfect for floating tubes in water baths, bathtubs or beakers. 3、SOFT FOAM: The test tube holder is made of high density polyethylene foam, which is soft and durable for long time use. 4、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 use. 5、5PCS: Foam centrifuge tube holders are five in total, sufficient quantity to meet your DIY experiment use. Item Type: Floating Foam Tube Rack Material: Foam Yellow 20 Holes Size: Approx. 9 x 9 x 0.9cm / 3.54 x 3.54 x 0.35in (Manual Measurement with 0.1 to 0.2cm Error) Yellow 17 Holes Size: Approx. 10.2 x 10.2 x 0.9cm / 4.02 x 4.02 x 0.35in (Manual Measurement with 0.1 to 0.2cm Error) Green 32 Holes Size: Approx. 10.1 x 8.1 x 0.9cm / 3.98 x 3.19 x 0.35in (Manual Measurement with 0.1 to 0.2cm Error) Pink 18 Holes Size: Approx. 10.1 x 7.6 x 0.9cm /3.98 x 2.99 x 0.35in (Manual Measurement with 0.1 to 0.2cm Error) Usage: for Storing 0.2ml, 0.5ml, 1.5ml and 2ml Test Tubes. 1 x Yellow 20 Holes Floating Foam Tube Rack 1 x Yellow 17 Holes Floating Foam Tube Rack 1 x Green 32 Holes Floating Foam Tube Rack 2 x Pink 18 Holes Floating Foam Tube Rack