This is a nice set of clean,  newest design PFC monoblock, angle bridge, internally plumbed, nickle plated race calipers w/ 4 piston differential bore 42mm / 40mm & ventilated titanium inserts.
Pad shape PFC #7823 PFC part# 49.323.410.440.01/02  These have larger pistons, much more stop power than the older design (10 years +) ZR22 calipers. As the pictures show, these are very low mileage.