The Kyocera FK-3100(E) fuser kit, part number 302MS9307, is a maintenance part for laser printers. It supports the fusing stage of printing, where toner is fixed onto paper.
This is the 220 V version. The listing identifies it for Kyocera FS-2100D, 2100D/KL3, FS-2100DN, 2100DN/KL3, FS-4100DN, 4100DN/KL3, FS-4300DN and 4300DN/KL3 printers.
The listing specifies a packaged quantity of one. The kit is intended for printer maintenance when the fuser assembly needs replacement.