Kit comes with carrying case and 10 different jet sizes ranging from 122-145. Great for the serious tuner who wants the engine to run perfect in all weather conditions. For use with 28mm & 30mm carburetors only. Carrying case and 10 pieces (122-145) Part Number: DB001000 For use with: Flat Slide Big Bore Carburetor 28mm (for 50-70cc) Flat Slide Big Bore Carburetor 30mm (for 80-125cc)