The Jim Casella Series keyboard mallets are designed to the specifications of leading marching percussion specialist, Jim Casella.This series has been designed to meet the demands of both the indoor and outdoor marching percussion ensemble.Each marimba model features a rubber core for maximum projection and the warmest fundamental tone.The IP1003X is a heavier version of the IP1003, built with extra weight in the core and an oversized Birch handle (11/32 diameter) to provide for a brighter articulation and extra projection.All four models are wrapped with a custom Synthetic yarn which offers a full, warm sound characteristic with proven strength and durability.The three vibraphone models, featuring Rattan handles, are constructed with rubber cores in a variety of shapes and weights to extend the dynamic range of the instrument.Tightly woven multi-ply Synthetic cord results in increased articulations and durability for maximum clarity and projection in both indoor and outdoor venues.The xylophone models feature Rattan handles and a soft plastic core to produce a full, dark tone with maximum projection.The IP1007 features an over-sized core, while the IP1008 features a smaller core with added weight, for better control.Both models produce a similar timbre.