Large foil bags for toner cartridges. Measurements: 13 x 23 inches . Protect your remanufactured laser cartridges with these antistatic bags.Fits HP 38, 39, 42, 45, Lexmark T series, and many more toner cartridges.Sold in 100 packs only. The reflective foil keeps the cartridge from exposure to light and is anti-static to protect against static discharge. The back keeps dust and debris from coming in contact with the cartridge. They need to be heat-sealed with a bag sealer