This clear microtube rack has been designed by Labnet to withstand the stresses of everyday use. The sturdy rack has been manufactured from a durable, proprietary plastic which is unbreakable and autoclavable. The clear microtube rack can be used in ice baths due to its open bottom. Two sizes of the clear microtube rack are available which can hold either 0.5 ml or 1.5/2.0 ml tubes.