T1: 8x11 inch (20 28cm) T2: 10x12 inch (25 31cm) T3: 11.5x14.5 inch (29 37cm) T4: 12.5x15.7 inch (32 40cm) T5: 15x18.5 inch (38 47cm) material: water-resistant and tear-proof Thickened PE These water-resistant and tear-proof pink bubble mailers are crafted for superior durability. Designed to resist punctures and damage, they provide reliable protection during transit. The thick air bubbles inside and the self-seal adhesive closure of each mailer offer excellent cushioning to guard against impacts, keeping your items safe and secure.