Why choose us？ We Metronic is the professional manufacturer specializing in producing all sorts of packing material.such as bubble mailers, poly mailers, bubble wrap roll etc.Our design group is a talented and experienced team,are a popular option among many businesses for shipping items. Feature: Waterproof,Tear-proof，Lightweight, Tamperproof Our mailers have a full bubble inside. It provides your package double safety protection and protect your privacy better. its cushioned wraps help ship your products to customers in a safe. Specification： Color: Black Size: Usable Size: 4x7"; Total Size: 4x8" QTY: Pack of 50 NOTE : Please note the size before purchase: Our bubble mailers usable Size is 4X7 inches. When the length and width of your item reach just 6X9 inches, and the thickness of your item exceeds 1 inch, please choose a larger size.