1000 Non-porous polyethylene sheets prevent items from sticking together when frozen. Stacks are easily broken apart. These sheets are FDA approved and are greaseproof, waterproof, and non-absorbent.1,000 sheets per box6″ x 10-3/4″FDA approvedHDPE clear filmGreaseproofWaterproofNon-absorbentMicrowaveable and freezableThickness= .45 milBPA free