We sell primarily three types of rings:

Type T has teeth and looks like a cog wheel. It may in some cases also have a flange on one side.

Type W has windows (holes) instead of teeth.

Type M has a multi-pole magnetic strip on the exterior or on the side.

Type T and W are passive rings. When the wheels rotate, they create a small inductive voltage difference on the wire windings of a nearby magnetic sensor.
Type M are active rings as they have builtin alternating magnetic poles, which produce a magnetic fluctuation and generates a more precise Hall effect.



See our product catalog for further specifications and images.