Cambro Round 12, 18 and 22 Quart Food Storage Cover, Clear. Made of Virtually Unbreakable Polycarbonate that will not Crack, Withstands Temperatures from -40F to 210F. Snap on Covers fit Tightly, Stain Resistant to Foods Acids and Oils. Great to use iny our hotel, Diner or Restaurant Kitchen with your Round Food Storage Containers to Keep Products Freshness. Check out the Other Sizes.