arm-bow-corrector arm-bow-corrector for cello Item No. ABC5 ResoundingFingerboard … The arm-bow-corrector for the benefit of a straight bow stroke!Learning aid for beginners and training tool for professionals!No mirrors or teacher are so unerringly!The specially developed plastic prevents damage, to the bow,the perfect tension of the material ensures a firm, slip-free fit on the fingerboard. × arm-bow-corrector for cello