Descriptions:1. 10 pcs 3.15x4.72 inchs（8x12cm） for 1.8"" hard drive, or for small oxidizable electronic parts, such as IC, LED, or headphone、data cable waterproof and moisture proof.2、Anti-static labels are convenient for your use,solved the troubles of your marking, promote the quality of your products, and highlight your company's professional 3. Translucent design makes it easy for you to find products and show them to customers.Improve your work efficiency and enhance customer experience.4.Note: Most electronic components contain gold, silver, copper, etc. These metals are relatively easy to oxidize and should be placed in a sealed environment so that they can not only prevent oxidation but also prevent moisture and prevent short circuits.5.If you don't know which size to choose bags, If you need to install a mainboard or an optical drive, please choose our larger bag 11.8x15.7/30x40cm. 6. Any question or asking for assistance, please feel free to contack us, we will be at your service.