These resealable poly bags are Made of 2 mil thick polyethylene material, good airtight performance, can keep items dry and neat, especially for mental and silver products Product Details: Plastic Bags Quantity: 100 PCS Color: Transparent Thickness: 2 MIL/side Material: PE Usable size: 2" x 2"(from the Zip Seal to the bottom of the plastic Bag) Closure: Zipper Heat Sealable: No Food Safe: Yes USES: Easier way to open small plastic bags Put pressure at the seal between your thumb and index finger,then slide the seal from different directions.