This is a brand new reinforced rear sprocket manufactured by Kitaco Co. in Osaka, Japan.
It fits Honda Supercub 125.
Brand new in pack.
Here are several technical informations from manufacturer:

DESCRIPTION
REAR SPROCKET WITH VARIETY OF TEETH LINE-UP AND REASONALBLE PROCE FOR BEST TUNING.
●HIGH TENSILE STRENGTH STEEL WITH HIGH DURABILITY IS ADAPTED.
●INSPECT EVERY 1000 km AND EXCHANGE WHEN FOUND TAPERED.
DAILY MAINTENANCE LIKE OIL LUBRICATING IS RECOMMENDED.

REMARKS
○420 SIZE


APPLICATION
●IT IS ATTACHMENT CONFIRMED TO THE FOLLOWING VEHICLES.
SUPER CUB50/PRO(AA04)・SUPER CUB50-PRO(AA07)・SUPER CUB50(AA09)・SUPER CUB110/PRO(JA07)・SUPER CUB110/PRO/CROSS CUB110(JA10)・MONKEY125(JB02)・GROM(JC61/JC75)etc.
●A CONFORMITY TABLE IS REFERRED TO.