?Tips:There may be a little error of measuring due to manual measurement. Please make sure to double check the size of your electronic components before purchg , do not forget to account for loss due to the rise of parts on the board(s). ?Multi-use ESD Bags: Suitable to store a variety of static-sensitive electronic components like hard disks, RAM, GPU, I/O cards, processors, motherboards and more! 6 x 8 Inch bags store 3.5" hard drives exactly, 4 x 6 Inch bags store 2.5" hard drives exactly and 3.15 X 4.72 Inch bags store 1.8" hard drives exactly. ?Resealable Antistatic Bags: Each anti-static bag is semi-transparent and translucent to allow you to see what is in them. No need for labeling them on the outside! Resealable anti-static bags have a ziplock closure to prevent contents from being exposed to humidity or static from your body. ?Material: Antistatic bags are made from Polyethylene Terephthalate , which offers multiple layers of protection. One layer is a silvery metallized film that protects electronic components from both mechanical and electrostatic damage. ?Package Include: Come with 20pcs Resealable Ziplock Antistatic Bag 12X16in/30X40cm and 20pcs Anti-static Labels, which can be Used to store a variety of static-sensitive electronic components.