A rotary encoder consists of an encoder-head and a codewheel or encoder disk. This type of rotary encoder is often referred to as kit encoder, frameless encoder or bearingless encoder. The encoder-heads are available in two versions: with a flat ribbon cable or as an encoder-chip that is suitable for surface-mount assembly. The codewheel is a Printed Circuit Board with copper patterns. POSIC offers several standard codewheels, but it is feasible to make your own.
POSIC is a Swiss company and delivers its inductive encoder kits worldwide.