Some witches will choose a single blade athame and use the straight edge to ring the bell for rituals. The handle of the athame is usually black and is required in most covens which practice some variant of British Traditional Wicca, including Gardnerian and Alexandrian. The handle may be inscribed with particular symbols dictated by the tradition. Janet and Stewart Farrar in "A Witches' Bible" suggest that the point of an athame be dulled so as to prevent un-intended physical harm during ritual use.