NO CORE CHARGE REQUIRED. Get Improved Performance That Looks Just Like The Original When Installed. Special O-Rings Are Used In Place Of The Original Lipseals To Eliminate Leaking And Resist Piston Cavitation During Hard Driving Conditions. Each Caliper Features: New Stainless Steel Sleeves New O-Ring Pistons Seals Springs Dust Covers Stainless Steel Bleeder Screws & Plugs Long Lasting Epoxy Paint. Every Caliper Is Individually Pressure Tested. Does Not Includes Caliper Mount Brackets. These Can Be Ordered separately Under Part# X2586 & X2587. Corvette Is A Registered Trademark Of The General Motors Corporation. Use Of DOT 5 Silicone Brake Fluid Will Void Manufacturer's Warranty. Only Use DOT 3, 4, Or 5.1.