I have a brand new in the box pair or strange evolution 4 billet calipers also comes with brand new pad's here are the factory spec's from strange. Four Piston Evolution 4 Caliper
• Computer finite element analysis (FEA) optimized and field-tested caliper
• Evolution 4 design improves piston retraction, pedal feel, and stiffness
• High retraction piston and O-ring design to eliminate drag during acceleration
• Results in improved pad wear and exemplary braking efficiency
Body
• 6061-T6511 fully machined billet aluminum
• Material enhances bridge stiffness
• Promotes smooth piston release
• Provides responsive pedal feel
• Two bleeder screws ensure complete air evacuation
• 5.250″ mounting bolt centers
Stainless Steel Pistons
• Material mitigates heat transfer to brake fluid
• Reverse dish pressure vessel piston maximizes stiffness
• Provides exceptional clamping force & improves pedal feel
the 1st. $325.00 plus shipping get's it all!
• High thermal resistance combats brake fluid boiling potential
• All pistons are 1.750″ for increased clamping force
High Retraction Piston O-rings
• Reduced rotational drag during acceleration
• Improves braking efficiency
• Increases brake pressure
