400 Self-Sealing Cardboard MailersHighest Quality and Value (6″ x 8″) Product Specifications: Dimensions: 6″ x 8″ Thickness: 250 GSM Quantity: 400 Pieces Additional Details: Self-sealing, peel and stick, adhesive keeps contents secure and tamper proof Extremely durable and lightweight cardboard material helps save on postage Provides bend resistance Surface easily accepts ink, stamps, and labels Approved for USPS, FedEx, UPS, and DHL On Jun-04-21 at 23:15:38 PDT, seller added the following information: