- *NEW* - our imitation ivory ferrules are now available with either Celtic or Victorian engraving - fully beaded and combed. - projecting mounts, ferrules, ring caps and bushings are imitation ivory (speciality made Delrin product) and are threaded into place. - other materials available for the projecting mounts (see options) - optional metal tuning slides are available in nickel, stainless steel, aluminum or brass. - when tuning slides are selected, wood hemp stops will be installed - blowpipe and blowpipe stock are made from Delrin