Product Specifications: —Dimensions: 6″ x 6″ —Thickness: 450 GSM Additional Details: —The tear strip tab at the top allows for quick and convenient opening —Self-sealing, peel, and stick, adhesive keeps contents secure 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.