The Roller 4x10 is the lowest priced item on this Cam Chain Tensioner schematic.
A sample from the products for the Cam Chain Tensioner include: Axle,rear Wheel, Axle Rear Wheel, Rivet A, 4mm, Spring, Tensioner.
The Cam Chain Tensioner assembly is constructed from several parts from which the Axle,rear Wheel is the most expensive.