Protect electronic components from static build-up as well as dirt, dust and moisture Made of antistatic polyethylene film. Constructed of heavy-duty 4-mil thickness. Close bags with twist ties, bag tape or by heat sealing. Office Depot (R) Brand 4-Mil Antistatic Flat Poly Bags, 6in. x 10in., Case Of 1,000 is one of many Poly Bags available through Office Depot. Made by Office Depot.