The Jim Casella Series IP1002 medium yarn marimba mallets are on birch handles and are designed for both indoor and outdoor percussion ensembles. The medium yarn wrapped around a rubber core creates full, warm tones that fit in perfectly with any ensemble situation. Polished birch handles are light and durable, perfect for long hours of practice or heavy-hitting performances. Medium yarn mallets are commonly used for general use on marimbas. Jim Casella's extensive expertise in music arrangement has contributed to the design of this well-rounded mallet series.