High Anti-Static Coefficient-The internal and external anti-static coefficient of the bag is above 9th, which is higher than the 6th to 8th power of others seller. Zip Lock Design - Resealable and durable.High quality layer bone strip seal to prevent water and moisture.Anti static sealing bags has high sealing performance,can be vacuumed to prevent oxidation of electronic components. Small Size ESD Bags - Meet your need,3.2x4.7in for 1.8" hard drive, 3.9x5.9in for 2.5" hard drive, 5.9x7.9in for 3.5"hard drive.The anti static bag also can be used for RAM,HDD, I/O memory card, earphone, button battery, and other small size electronics parts storage. Premium Material:CPP+PET double-layer composite material, anti-static double-sided layer, with aluminum plating film, thicker material,more toughness and durable. Wildly Used-Anit Static Bags: Package included:10pcs 3.2x4.7in/8x12cm,10pcs 3.9x5.9in/10x15cm,10pcs 5.9x7.9in/15x20cm anti static bags,come with 30pcs antistatic labels.YIMIKE anti-static bag not only for electronic,also suitable for storaging of daily necessities.