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With a range of improvement and innovation on the basis of ZJ457A,this machine is more convenient for operation and setting; the sewing performance more stable; due to the lower tension, it can reach the perfect seam even when the fabric is fine. Mean while, it can prevent from the happening of stitch skipping and thread breaking effectively. It is suitable for sewing light and medium-heavy material of underwear, knitting, bra, trousers, gloves, shoes, caps and so on.