flash drive .4. Two cams for double picking and double pressing needles during heel steps. The productivity and knitting quality are superior than the traditional single-cam machine.5. More color options of up to 2 main feed + 4 pattern feeds .(13 colors )6. Pneumatic system to control yarn finger .7. Stepping motor to control elastic yarn feeding for various course sizes , with options of single or two colors .8. Automatic lubrication system . The oil injection is controlled by microcomputer .