Aluminium.
Rim flanges, steel.

Aluminium bright.
Steel galvanised.

Standard HTD profile with metric graduation (semicircular toothing). At least one toothed belt pulley must have a rim flange. The toothed belt pulleys have a centre bore. This centre bore can be customised with a reamed hole, reamed hole with keyway or a tapped hole by the customer.
To reduce weight, the toothed belt pulleys may have a recess on one face.