Vic Firth Corpsmaster Andrew Markworth Keyboard Mallets Soft Marimba Yarn 100% synthetic yarn with double-stitching provides maximum durability and weather resistance Large 11/32"-diameter, 16-3/4"-long birch shafts on the marimba mallets Thick 16"-long rattan shafts on the vibe mallets Most recently, his design and instruction helped propel the Carolina Crown Drum and Bugle Corps to a silver medal finish at the 2009 DCI World Championships "My goal with this mallet series was to create maximum sound projection while maintaining a dark tone quality," states Markworth