The large Anti Static Bags is approx 29.5*40cm/12x16 inch ,it can store almost All Electronic Components, Laptop PC parts, static-sensitive electronic parts like HDD hard drives, motherboard video cards, RAMs, Processor, I/O cards, etc. Ideal for storing and shipping. 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 4.8 mil Thickness SEMI-TRANSPARENT Plastic Static Free Bag is thick but also can easily see what's inside the bag 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, LED light bar PCB and more Package includes 20-Pack reusable top open design anti static bags and 20 PCS Self adhesive ESD shielding anti static sign stickers to seal up the bags.