Shimano Mf-Tz500-6/7 Tz21 Speed Bicycle Bike Cassette Freewheel 14-28t 14-34t Sprocket 7s Steel for Bike Bicycle Parts - China Shimano Bike Parts, Freewheel | Made-in-China.com
Shimano #MF-TZ21 7-speed Freewheel with 14-28 teeth from 2012 – Velosaloon.com