采用特殊锻造工艺制作的花纹钢材料，手工抛磨的外观，表面花纹清楚优美;框架由精密线切割加工【保证尺寸的精密度，避免手工机尺寸的误差】线圈采用{zx1}工艺，进口10圈电磁阀，3V启动6—8V正常工作，运行频率2500转，弹跳稳定 ，后座磁力强等优点。 Damascus steel features: 1.Material:Damascus Steel 2.Manual polished surface,clear and beautiful patterns 3.Precision wire cutting frame, Ensure the accuracy size,and avoid the error of manual machine 4.Come with a 10 wraps manual winding coil,3V to start 6-8V to work,running frequency of 2500switch/minute 5. Stable bouncing,stable needles,strong magnetic back seat,fine workmanship,beautiful appearance,good touching 6.Unwarming for long time using