This is a brand new reinforced brake shoes set manufactured by Kitaco in Osaka, Japan.
It fits Honda Z50J Monkey and many other minibikes..
Here are several technical informations from manufacturer:

DESCRIPTION
HEAT-RESISTANT SPECIAL LINING IS ADOPTED ON THE MATERIAL.
EXCHANGE WITH NEW ONE IF THE REMAINING 1 mm OR LESS.

REMARKS
○NON-ASBESTOS


APPLICATION
●FOLLOWING FRONT :
MONKEY/GORILLA/MONKEY BAJA
CHALY50/70・DAX50/70
SUPER CUB50/PRESS CUB
FNO,C50-3000001~0327924 etc.
●FOLLOWING REAR :
MONKEY/GORILLA/MONKEY BAJA
CHALY50/70・DAX50/70
SUPER CUB50
FNO,C50-3000001~9501273●REFER TO APPLICATION TABLE FOR DETAILS.