Sewing star offers hi-speed stretch sewing machine. This hi-speed stretch sewing machine is suitable for kit material, mainly for under garments and seaming. The flat lock machine applied with oil recycle system can control oil and avoid any leaking. Due to be equipped with needle cooling system, this machine can avoid the thread and cloth that can be melted because of high temperature. It also comes with needle protection system to reach a steady and perfect seaming stitch. Because of the adjustable material feed structure and needle gauge, this machine makes a great progress in efficiency.