7x10 inches padded poly envelopes, poly film outside. The bubble mailer envelopes feel nice to the touch and are perfect for handwriting, labeling and stamping. ✅ COST-EFFECTIVE - The padded envelopes are lightweight and waterproof, shockproof, dustproof, tearproof. ✅ SELF SEALED ENVELOPES - The self-seal closure provides a reliable, tamper-evident tight seal