Four-of-a-Kind Postcards White Premium Heavy Matte Blank Postcards (250 sheets/1,000 postcards) Works In Laser Or Inkjet Printers 4 Postcards Per Sheet - Each postcard measures 5.5" X 4.25" 216 GSM (80 lb Cover) ** Make sure your printer can handle this weight of paper Thickness is 8.9 caliper - Meets USPS Postcard Regulations 1,000 postcards (250 sheets) per pack