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.1 1/8" Round Poly weighted Core mounted on a Rattan HandleClassic round shape for a fuller sound and natural feelGo-To mallet for a variety of xylophone/ glockenspiel repertoire14.250" Overall LengthCompare to former model, Vic Firth Orchestral M138