HP Officejet Pro K550 Printer - Manual (Page 24)

Media size Tray 1 Tray 2 Duplex unit
A2 Envelope (111 by 146 mm; 4.37 by 5.75 inches)
DL Envelope (110 by 220 mm; 4.3 by 8.7 inches)
C5 Envelope (162 by 229 mm; 6.4 by 9 inches)
C6 Envelope (114 by 162 mm; 4.5 by 6.4 inches)
Japanese Envelope Chou #3 (120 x 235 mm; 4.7 by 9.3 inches)
Japanese Envelope Chou #4 (90 x 205 mm; 3.5 by 8.1 inches)
Cards
Index card* (3 by 5 inches; 76.2 by 127 mm)
Index card* (4 by 6 inches; 102 by 152 mm)
Index card* (5 by 8 inches; 127 by 203 mm)
A6 card* (4.13 by 5.83 inches; 105 by 148.5 mm)
Hagaki* (100 by 148 mm; 3.9 by 5.8 inches)
Ofuku Hagaki* (148 by 200 mm; 5.8 by 7.9 inches)
Photo media
Photo media* (3 by 5 inches; 76.2 by 127 mm)
Photo media* (4 by 6 inches; 102 by 152 mm)
Photo media with tear-off tab* (4 by 6 inches; 102 by 152 mm)
Photo media with tear-off tab* (4 by 8 inches; 102 by 203 mm)
Other media
Custom-sized media* between 3 to 8.5 inches wide and 5 to 14
inches long (76.2 to 216 mm wide and 127 to 356 mm long)*
* These media sizes support manual duplex. See Printing on both sides (duplexing) .
16 Chapter 3 Using the printer ENWW