... muscle sewing for light and mid heavy weight gloves made of cotton cloth, undershirt cloth, rubber patch, cashmere, cony hair, leather ... , etc. .Features:.Consists of four stitch back muscle (three muscle), three stitch back muscle (two muscle), two stitch back muscle (1 muscle ... presser foot to achieve shifting different back muscle..Specification:.Max. sewing speed1,500spmPresser foot ...