Designed for solo xylophone use, Bob Becker’s original blue plastic model remains a best seller. They are light and easy to maneuver quickly around the instrument. The rattan handle diameters are 7.1 to 7.5 mm. These mallets will not damage rosewood bars in any way. The BB34 are a medium-bright, lightweight xylophone mallet with a clear, but not overly bright, tone. The best selling mallet in the world. Often imitated, never duplicated.