9″x 11.5″ IS THE ACTUAL USABLE SIZE Thickness: 550 GSM Paper Board/28PT (Heavy Duty) White exterior with Brown interior for privacy! Great for shipping items like DVD’s, 8″ x 10″ Photos, etc. Premium Quality: These mailers are made extremely durable, strong seams & adhesive like permanent glue yet very light in weight! Simply pack, peel and seal! Lower shipping cost for your business! Approved by USPS, FedEx, UPS, DHL, etc. 100% recyclable! ***Need large quantity or have questions? Please message us! Thanks