★The Anti-static reusable bags are made of Quality LDPE ( low-density polyethylene ) which is not only Chemical Stability,Flexible and Sturdy, but also Non-toxic and free from extraneous odor, it guard PC parts and electronics from ESD effectively ★Package includes 20 PCS reusable top open design anti static bags and 20 PCS Self adhesive ESD shielding anti static sign stickers to seal up the bags ★4.6 mil Thickness SEMI-TRANSPARENT Plastic Static Free Bag is thick but also can easily see what's inside the bag. Ideal for intercompany transfers, storing and shipping ★The large Anti Static Bags is approx 30.7cm x 40cm/ 12”X15.8” ,great size and allow various PC components, static-sensitive electronic parts like HDD hard drives, motherboard video cards, RAMs, Processor, I/O cards, etc to be stored safely ★The Anti-static bags is totally a no-brainer necessity for protecting your more valuable electronic goods such as hardware, arcade boards, large graphics card, electronic components, PC parts, laptop components etc