50 Pack 9" x 12" resealable cushioned static shielding bags, ideal for transportation and storage of electronics and computer parts. Each bag weighs only 0.82 ounce. These lightweight ESD protective bags feature closed cell air-cushioned protective layers for heavy duty protection that absorbs impact and prevents product damage. The bags are reusable and easily sealed or opened using the convenient zip slider on the top, saving packing time and labor — no need to cut and tape loose bubble wrap. 20lb Puncture Strength Average - High puncture resistance provides physical protection for contents. Made in the United States of America.