The bb40 is a traditional mallet that is perimeter weighted which creates a larger sweet spot with a classic shape and extended sight line for easier alignment this remarkable putter generates confidence at address the bb40 mallet is the perfect compliment to the classic blade putters in the 2016 bb series lineputter 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 manufactu