Clear plastic cover GN 1/1 high stacker, Made of PETG: Polyethylene terephthalate glycolyzed. PETG is known as glycolyzed polyester. The "g" represents the glycol incorporated mainly to decrease the slightly brittle appearance of polyethylene terephthalate (PET). Amorphous plastic, 100% recyclable. Very resistant to breakage. Tray fixes itself on the cover and can not slip off. Suits trays 11300, 11290, 11295.