Memminger's positive yarn feeders include the MPF K, which features a vibration-free yarn tensioning unit with magnetic braking rings that also functions as an automatic cleaning device. It minimizes faulty stops; eliminates braking disc cut sawing; offers uniform slipless, drag-free yarn transport; and reduces maintenance costs. Memminger's MER 2 positive yarn feeder for elastane yarns uses the roll-off principle to feed bare elastane yarns. Two continuous drive shafts hold the cylindrical bobbins. The volume of yarn fed corresponds to shaft speed. The EFS 610 yarn feeder feeds coated and bare elastane yarns as well as hard fiber yarns to sock and hosiery machines. Other devices include the Pulsonic 5 pressure oiling device and Filtercreel 2 lint reduction device.