Can be used on any ring-frame of 3 or 4 rolls. The complete system consists of 2 parts

1. (a)   A mechanical unit (Gear Box Device) with Clutch & Brake combination. 
2. (b)   An electronic control unit which imparts electric impulses to the Clutch and Brake unit.
3. The COLORED Roving is fed from the back-roll and the GROUND YARN is spun with roving fed to the middle roll directly.