9" x 11.5" Silver Metallic Bubble Mailers Padded Self Seal Mailing Envelopes Pack of 100 Usable Dimensions: 8 x 11.25. Color: Silver, Paper Liner: White. Provides excellent protection during shipments. Aluminum Foil with Bubble Lining, Bubble Lining: 3/16. Approved by UPS, FedEx, and USPS.