LIGHT WEIGHT MAILERS - This pack of 25 6x10 inch padded envelopes is made from heavy duty plastic, are with fashionable design. And those padded mailers are lightweight mailing envelops, will not add to your shipping cost. CUSHION MAILERS - These mailer envelopes are lined with 80gsm bubble, with unique air cellular layers and 360°strong air bubble technology helping absorb shock during shipment.These can provide effective shipping protection for your products. SELF SEALED ENVELOPES - These bubble mailers come with a self-adhesive tamperproof seal.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.Peel and stick lip provides a tamper evident closure.