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 3.9x5.9in anti-static bags for 2.5" hard drive.The anti static bag also can be used for earphone,button battery, other small size electronics parts and storage other small things,such as business card, baby wipes, washers, screws, nuts, costume jewerly, gift card, earring backs, passport style pictures, sewing etc. Premium Material -CPP+PET double-layer composite material, anti-static double-sided layer, with aluminum plating film, thicker material,more toughness and durable. Widely Anti Static Bags - What you get :50pcs 3.9x5.9in/10x15cm anti static bags,come with 50pcs antistatic labels.YIMIKE anti-static bag not only for electronic,also suitable for storaging of daily necessities.