We are excited to be on this forum! Concept One Pulley Systems is a product line of Redd Machining and Manufacturing, Inc. founded by Kevin and Randy Redd in 1996. The first Concept One complete pulley system was introduced in 2001. Concept One’s goal is to provide easy to install pulley systems that improve drivability and look great at a competitive price. We use only top quality materials machined to exacting tolerances and components from such companies as Continental®, Edelbrock®, Delphi® and Powermaster®. Superior customer service and technical support continue to be our priority.