LEM 1000 Non-porous polyethylene sheets prevents meat from sticking together when frozen. Stacks are easily broken apart. These sheets are FDA approved and are greaseproof waterproof and non-absorbent. Mfg 1 Year Warranty. 1000 sheets per box 6" x 10-3/4" FDA approved HDPE clear film Greaseproof Waterproof Non-absorbent Microwaveable and freezable Thickness= .45 mil BPA free