These are new 300 DPI assemblies for a scanner. There are 3 front surface mirrors, a mounted lens assembly and we think a laser diode with circuit board. While we are not sure which model machine these came from, the serial number is 50603089-FM5-A. The stepping motor attached is a Mitsumi M42SP-7 (35 ohms). 11-1/4" x 3-1/4" x 3-1/4". Made in Korea. All kinds of good stuff in this. Never used.