Excellent clean used set of Nascar Alcon Nickle plated billet aluminum Monoblock 4 piston front race calipers 

w/ differential bore 1.63" (41mm) x 1.50" (38mm) coated, vented, Titanium pistons for PFC  pad shape 7700

ect. Recommended  rotor diameter is 12" (305mm) x 1"-1.25" (25-32mm) rotor thickness. Come with removable

stainless trash guards. See full Alcon spec sheet in the second photo. These are the TI model. Mount hole ctc 

is 210mm. Super light weight, only 4.3lbs per caliper!