Advanced Materials & Tribology offers Roller Followers with Precision Retainer. Advanced Materials & Tribology supplies a wide range of Oil-less self-lubricated Bearings and Plates, Self Lubricating Bushes and Pump Bearings. Advanced Materials & Tribology is an ISO certified company. The Roller Followers with Precision Retainer is a separable bearing with needle rollers that can be installed in a thick-walled outer ring and inner ring.