This clear polypropylene cover for 96-well micro tube racks easily snaps on to keep it firmly in place during transportation and storage. A recessed area in the top of the cover allows for secure stacking of racks one on top of each other. The snap on cover is designed to accommodate the extra height of screw cap microcentrifuge tubes. Material: Polypropylene. Feature: Snap On. Number Of Wells: 96. Color: Clear Natural. Bio Plas #: 0052.