1.Use ultrasonic energy to cut, weld, seal seam, hole, emboss, stitch, slit, form. color & fold. 2.Need no traditional needle & thread.Generally need no plastic film & paper. 3.No dissipated edge, wrinkle & shrinkage. 4.Can work continuously for mass production.can work curves; easy to change Rollers. 5.Can print color on the laces with colored paper. 6.No smoke, spark , danger. 7.Accurate & durable alloy Rollers are designed by computer aid & made with sculpthured molds. 8.Thousands of pattern roller designs available.