Oki C9655n User Manual page 14

Envelopes
Envelopes should be free from twist, curl or other deformations.
They should also be of the rectangular flap type, with glue that
remains intact when subjected to hot roll pressure fusing used in
this type of printer. Window envelopes are not suitable.
Transparencies
Transparencies should be of the type designed for use in copiers
and laser printers. In particular, avoid office transparencies
designed for use by hand with marker pens. These will melt in the
fuser and cause damage.
Recommended type is:
CG3720 by 3M (A4 or Letter size)
Labels
Labels should also be of the type recommended for use in copiers
and laser printers, in which the base carrier page is entirely
covered by labels. Other types of label stock may damage the
printer due to the labels peeling off during the printing process.
Recommended type is:
Avery White Laser Label types 7162, 7664, 7666 (A4), or 5161 (Letter)
CAUTION!
CAUTION!
CAUTION!
Printer and paper overview > 14