Kraft bubble mailers measure 9.5 inches wide by 14.5 inches long interior usable dimension. Each mailer consists of exterior kraft paper laminated to interior polyethylene bubble cushioning layer. The kraft paper exterior is constructed from 60 gsm natural brown material. The bubble layer contains air-filled cells measuring approximately 3/16 inch diameter. Self-sealing adhesive strip runs along the flap edge and activates by pressing the flap down onto the mailer body. Each mailer weighs approximately 0.12 pounds. The polyethylene bubble layer absorbs impacts during transit by compressing individual air cells. Pack contains 200 mailers total. Mailers accommodate flat items measuring up to 9.5 inches by 14.5 inches. Closure process: insert item, fold flap over opening, press adhesive strip firmly to seal. Each case ships as a single carton containing all 200 mailers. Total case weight approximately 24 pounds. Manufactured in the United States. Mailers correspond to standard #4 size classification in the bubble mailer category.