Made for Inkjet Printers but not compatible with all printers due to the thickness of 0.35mm. Glossy coating on both sides, heavy duty postcards 4 x 6 inches. Print your own postcards at home with United States Post Office compliant postcards, standard size. Quick dry coating. Recommended to use with Inkjet Printers, printer must be able to print using a 4 x 6 inch setting, these are not tear off sheets and are exactly 4 x 6 inches that come in 50 packs. Due to thickness some inkjet printers may not be compatible, please confirm your printer can accept the thickness of 0.014 inches or 0.35 mm. Known printers that are compatable are Epson 8550 rear feed and Canon Pixma. A lot of HP printers are not compatible and can not handle the thickness.