These Jiffy Airkraft padded mailers are lightweight and economical to help keep postage costs down. The mailers feature a fully laminated lining of Astro SupraBubble for extra strength and puncture resistance, and a strong self-seal closure. Ideal for mailing delicate or fragile items, the mailers are also impact resistant for protection during transit. These size 4 mailers measure 240 x 320mm. This pack contains 100 gold mailers. The bubble that inner lines the mailers is produced using a minimum of 30% recycled content.