Short Arm Cylinder Bed Double Needle Compound Feed Sewing Machine | Filter Bag Bottom Sewing Machine Features: ES-4331 sewing machine uses compound feed system to prevent material slippery. Upper and lower axis is driven by synchronous gear belt. Needle distance is adjustable by setting the knob. There is a safety device to protect the machine in case of overload. Energy saving servo motor; Pneumatic presser foot lift; Automatic needle position (needle is always above the fabric after sewing)