Description Material: OPPmatt19/AL7/PE110 with Aroma Protection Valve Colour: Red (500 gm) Unprinted Thickness: 28 wires=0.28mm(Double sides) Use: Packaging coffee beans Sealed Aluminum Foil One Way Air Valve Size : 500 gm Color : Matte Finish 500 gm : Red Performance: 1. A variety of colors can be chosen 2. Safe, antibacterial and anti-mildew material, non-toxic and odorless 3. Thicker material, good sealing, not easy to break the bag, can play a very good moisture-proof effect and dirt repellent