Improved Prusa Filament Sensor. Button version is not compatible with Prusa and Zaribo MK3s+ Series.

Item picture is a computer-generated image. Cable and magnets are optional. 

Prusa Filament Sensor With LED Compatible with Original Prusa, Zaribo, and Bear 3D Printers.

Item picture is a computer generated image. Cable and magnets are optional. 

MK3s including sensor, cable, steel ball, magnets, screws

PINDA 2 probe is a proximity sensor with a special thermistor embedded inside.

Colour can be black or gray.