The versatile Promega Flipper® Racks are ideal for storage and transport of all of your small tubes. These polypropylene racks withstand extreme temperatures, making them an excellent choice for freezer storage. They also may be autoclaved for use in sterile environments. Each rack is two-sided; one side accommodates 0.5ml microcentrifuge tubes, the other side accommodates 1.5ml tubes or 2ml cryogenic tubes. The Blue Flipper® Rack holds 64 tubes, and the Purple Flipper® Rack holds 96 tubes. Clear lids permit easy viewing of rack contents.