The bb8 has a two tiered heal and toe weighted cavity back design that has squared off bumpers and topline combine this sharp look with a plumbers neck and you have one of the all time classic putters ever made the bb8 has our patented honeycomb face to ensure the flattest surface possibleputter materialsoft carbon steelall of our production model putters are milled from a proprietary blend of soft carbon steel because we machine all of our putters in our own manufacturing facility we only