Material: POM-H. Screw nickel-plated steel.

The chain rider set is mounted on the suitable tensioning element to
create a ready-to-mount, cost-efficient chain tensioner. The shape of
the rider, made of high-grade, friction resistant, industrial plastic,
means the rider can be used on both rider sides and the large radius
guarantees quiet operation. The maximum chain speed must not exceed 1,5
m/sec. Temperature range: -40° to +100°C. Tensioning Element has to be
ordered seperately.