Made from LLDPE Polythene, Air Retention Bubbles, 30mm Top Flap with Self Seal Strip. Bubble Pouches with Self-Sealing strips is proven to protect and cushion fragile or sensitive items during transit. Each bag has a glue strip seal to ensure the contents will not be displaced and feature air retention bubbles to prevent air loss when the pouches are subject to pressure. Manufactured from strong LLDPE polythene for added protection.