I'm a fiddle player, & had a long talk with a mate on the way to a gig who deals in Violins, bows etc, he was very concerned...nearly all good old bows have an Ivory tip guards @ the sharp end.Abalone n Mother of pearl are also pretty heavily regulated,& might need paper work as regards to the Specific Species of said material for Christs sake! or so he said...could be a nightmare in many occupations if they get the magnifying glass out
franc