16" x 17.5" Black Metallic Bubble Mailers Padded Self Seal Mailing Envelopes Pack of 50 Usable Dimensions: 15 x "17.25. Color: Black, Paper Liner: White. Provides excellent protection during shipments. Aluminum Foil with Bubble Lining, Bubble Lining: 3/16. Approved by UPS, FedEx, and USPS.