The Vic Firth Articulate Series Keyboard Mallets are a comprehensive collection of sounds across Xylophone and Bells/Glockenspiel. With over 40 options spanning various materials, sizes, and weights, the Vic Firth Articulate Series is your one-stop-shop for finding the perfect sound, no matter the venue or repertoire. The M423 features a 1 1/8" round poly core with the addition of an internal brass weight for a bit more projection from the instrument. Great on xylophone or bells for a variety of repertoire.