The Meucci Carbon Fiber Shaft has a polyurethane foam and it is core plugged with maple. It creates quite a deep and warm sound when it strikes the cue ball. This also has a ferrule that is of 3/8" proprietary and it rivals the others that are available in the http://www.sgpropertiestop.com/index.php?page=user&action=pub_profile&id=66202