This is a new old stock (NOS) CDI box for certain Yamaha bikes years 1990-1996. The part does not have original packaging, but it has never been installed. The box fits the following:

1990-1994 YZ250
1991-1996 WR250

This may have other uses for fitment, but verify with the provided part number and a reputable source before purchase. Positive feedback is appreciated when you receive your purchase. Thank You.