2 Piece Bolted Design Incorporates High-Tensile 12.9 Grade Steel Bolts For Reinforcement Of The Caliper Bridge Section,Every Single Brake Caliper Pressure Tested To 2500psi,This Offers A Noticeable Performance Advantage Over Conventional Gravity Cast Calipers,Uses Standard Pad Shapes; Giving Choice When Selecting Brake Pads,EBC Lightweight-Yet-Strong Aluminum 6-Piston Brake Caliper,Machined From Heat-Treated Low-Pressure Castings,Exhibiting Higher Overall Strength And A Comparable Caliper Body Stiffness To Forging,Polyester Coating Process To Ensure They Look Great For Much Longer,Full Stainless-Steel Hardware/Fittings; Providing Durability/Longevity; This Caliper Will Never Rust,Rather Than A Powder-Coated Finish; All Apollo Calipers Use An Advanced High-Temperature Teflon,High-Temperature Fluid Seals Coupled w/Full Boot-Type Dust Seals Give Maximum Protection Against Road Grime/Debris,Computer FEA Analysis Shows That This Offers Significant Improvements In Caliper Stiffness Compared To A Monobloc Design