25 #7 (14.5 X 20) Bubble-Lite Self-Sealing Bubble Lined Mailers Cushioned Mailing Envelopes Exterior dimensions 14.5" X 20" Interior (usable) dimensions: 14.5" x 18.5" Golden Kraft paper is 48# polycoated ,100% recycled, 25% PCR 3/16" Bubble is 4 mil with 6% slip (to ease insertion). 1" lip and tape self seal closure is hot melt adhesive covered with silicone coated release liner Air cushioning offers maximum protection