T1: 6x7.5 inch; 15x19cm T2: 7x9 inch; 18x23cm T3: 8x10 inch; 20x25cm T4: 10x12 inch; 26x30cm T5: 11x14.5 inch; 29x37cm T6: 12.6x15.7 inch; 32x39cm T7: 16.5x14 inch; 42x35cm material: water-resistant and tear-proof Thickened PE These water-resistant and tear-proof black 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.