Widely Usage: Stylish modern reusable antistatic bags work on all electronic parts, including Hard Disks, RAMs, Processor, I/O cards, Ideal for various computer parts / electrical components, etc. Recloseable & Easy to use: Re-sealable with zip lock design, reusable. Thickness: 0.075mm/ 2.95 Mil (one side). What is Mil? "Mil" is the plastic thickness. 1 Mil = 0.001". High Quality: The bag is made of Polyethylene Terephthalate (PET) that is non-toxic and free from extraneous odor. It can prevent static electricity effectively. Package Include: 200PCS Antistatic Bags; Size: 7 x 11cm/ 2.75 x 4.33inches, which can be used to store your electronic parts and gadgets.