SST Conveyor Components, Inc. framesaver cartridges are for use in rollers using swedged construction. They have a steel-forged shaft that locks into frame and urathane tip pins, which prevent frame wear out. They are spring-loaded for easy installation and replacement, reducing inventory and assembly costs. They come with two ABEC-1 precision bearings per cartridge (6203ZZ on front and 608AA on backside).