Stack Racks provide a cost-effective and environment-conscious alternative to racked tips. For single-channel and multichannel pipettors Half the weight of conventional racks Stack racks provide same amount of tips with less plastic Stackable racks of tips in the 8x12 (96 tips) or 8x24 (192 tips) configuration utilize the same bottom and lift-off lid, minimizing unnecessary plastic. Lid and bottom are hinged for use as a storage box when empty, or may be reused with Stack Rack refills. Storage box can be autoclaved after tip use. Tips are DNase- and RNase-free. Sterile tips are endotoxin-free. Graduated tips are marked at 10, 20, 50, 100, and 200µL.