Unwire™ Full Racks, Polyketone, model 5970-0216 is manufactured by Thermo Fisher Scientific. This product is made from durable polyketone, without coating which can chip or peel and permit corrosion. Ideal replacement for wire racks. It can withstands most laboratory chemicals. Excellent thermal performance and won't get brittle in freezers. The grid design enables tubes to be tipped from side to side to clearly mark the position. These racks will not float in water baths.