This is the shimano saint m820 2013 4 piston post mount brake calliper featuring shimanos new ice technologies heat management system high power 4 ceramic piston calliper easy and clean bleeding thanks to one way bleeding calliper and new funnel bleeding tool the third generation of saint the m820 group was developed under the pure gravity design philosophy with a clear focus on downhill speed new saint is dedicated to dh racing new saint enhances concentration and focus through sea