labForce® benchtop tube racks are made of 100% polypropylene and are available in three popular configurations. A 4-way rack that can be used to hold 4x 50ml, 12x 15ml or 32x micro tubes (0.5, 1.5 or 2ml). They can be snap-linked together to form as large as rack as is needed. A combo rack for that holds 30x 15ml and 20x 50ml. And reversible racks for 1.5ml on one side and 0.5ml on the other.