Superior Barrier Bubbleï¿½ air cellular cushioning offers great protection for items from jewel cases to books. Fully laminated, heavyweight Kraft construction delivers outstanding rip and puncture resistance. Seamless bottom provides extra strength and stability. Self-adhesive closure produces a secure, peel-and-press seal. Envelope Size: 4 x 8; Envelope/Mailer Type: Cushioned; Closure: Self-Adhesive; Trade Size: #000.