Descriptions: 1. 40 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. 30 pcs 3.94x5.9 inchs(10x15cm) for 2.5" hard dirve, as well as mobile hard disk, RAMs and so on.3. 30 pcs 5.9x7.87 inches?15x20cm?for 3.5" hard drive?memory and other bigger size electronic parts.4.Gift 100pcs 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.5. Translucent design makes it easy for you to find products and show them to customers.Improve your work efficiency and enhance customer experience.6. 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.7. Items such as headphones and cables, often entwin in the bag, which may cause damages. It is more neat and clean to be packed with a dampproof and waterproof bag while traveling. 3.94x5.9 inchs(10x15cm) bag is recommended.8. Tips: before purchasing, please check the size you want, if there is a big gap between the thinkness of the item and that of the bag, then please take the item as priority, and choose a bigger size of bags.9. We have large size bags:8.26x9.45(21x24cm) and 11.8x15.7(30x40cm) for Motherboard 10. Any question or asking for assistance, please feel free to contack us, we will be at your service.