Brightly-colored, high-density polyethylene foam racks are ideal for floating tubes in water baths, tubs, or beakers. Closed-cell foam resists water absorption so racks can be washed and reused. The blue round rack features unique "X" slits to hold a variety of tube sizes. Racks include carrying handles easy to lift samples out of baths. Pack of 5. 50 Milliliters 4 tube.