This is a light fixture for adding movable LED lighting to 28mm miniatures terrain. This model includes three parts connected by sprue: (1) the main housing, (2) the magnet housing, and (3) the wiring compartment cover. This fixture accomodates a single LED. You will need a few things to complete the light fixture:
1.
3-Volt coin cell holder with switch
2.
3mm 3-Volt LED light
3.
a rare-earth disc magnet (0.375" diameter x 0.125")
The default material for this model is Gray PA12, a slightly grainy but very strong nylon. The natural texture lends itself to a corroded look when painted. The other material option is Smooth Fine Detail plastic. It has a smooth finish but is not as strong. The video on the bottom of this page has assembly instructions.