JT Steel Sprockets are the OEM quality choice, manufactured using only the finest grade of C49 high carbon steel for the rear sprockets, and SCM420 chromoly steel alloy for the front sprockets.
Fits:

Honda CR250R RG 1986, Honda CR250R RH 1987, Honda CR250R RJ 1988, Honda CR250R RK 1989, Honda CR500R RG 1986, Honda CR500R RH 1987