Ladyfsu, the paper is a pattern for a metal halide reflector. You cut the pattern out and transfer it to the metal (spectral aluminum). It makes a 14 inch square, 6 inch deep reflector. The white metal parts are an adjustable mogul socket for the bulb. It mounts outside the reflector with the bulb going through a hole to the inside of the reflector. It's adjustable so you can center the MH bulb for best reflectivity.