DIMENSION: 2334cm padded envelopes(usable size 2330cm), with opaque black poly film. The bubble envelopes feel nice to the touch and are perfect for labeling and stamping. The padded envelopes are lightweight and water-resistant. Lower the shipping cost of your business and protect your products on the rainy or snowy day. The adhesive on the fold-over flap is strong enough and goes end-to-end. There’s no need reinforcement tape and it doesn’t come apart unless you tear it up. These are black mailer envelopes lined with 80gsm bubble. The padding is sufficient to mail small and the items that needed protection. Keep your products safety and make your customer no complaint. The envelopes are strong and you could mail fragile items (within the usable size 23*30cm). The quality of the mailer will hold up them in shipping well.