The SimpleSpin Dual Gobo Rotator from Rosco is an accessory with a built-in power supply that allows you to rotate two 80 or 86mm outer diameter metal or glass gobos from 0.1 to 3.5 mm thick, in opposing directions using select light fixtures. The SimpleSpin has a variable speed stepper motor with speeds from 0.5 to 24 rpm adjustable on the unit, but is also able to use an external dimmer as a potentiometer to regulate speed. The SimpleSpin is compatible with ETC Source Four, ETC S4 Zoom, Selecon Pacific, Selecon Pacific Zoom and Altman Shakespeare lights.