Available Paper; Epson Special Media; Paper Handling - Epson AcuLaser C4000 Owner's Manual

Available Paper

This section explains what kind of paper you can use with your
printer. Avoid using paper not mentioned in this section.
Note:
The printer is extremely sensitive to moisture. Be sure to store your paper
in a dry environment.

EPSON special media

EPSON provides special media created especially for this printer.
EPSON Color Laser Paper
You can load this media from the MP tray, the standard lower
cassette, or the optional Large Capacity Paper Unit.
S041215 (A4)
S041218 (Letter)
EPSON Color Laser Transparencies
You can load this media only from the MP tray.
S041175 (A4)
S041174 (Letter)
Caution:
c
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Paper Handling

Do not use other EPSON media such as EPSON special
media for ink jet printers, as this can cause paper jams and
damage the printer.
Do not use the media listed above in other printers, except
when specified in the documentation.