This product is made from white co-extruded polythene film with 3/16 bubble lining. The multilayered construction provides excellent protection for articals. Multilayer blend with transparent bubble. Heavy-duty mailer with exceptional tear strength and cushioning performance. 2 sided protection. Self-Sealing with hot melt glue. It used for shipping promotional items, paintings, medical and clothing, handmade crafts. Perfect for mailing fragile items. Ideal for post offices, courier & express companies, logistic and parcel shipping companies, office stationery suppliers. Retais, in bulk or wholesale. 5 1/8"L x 5 7/8"W