The JM17R maintains a pure vibraphone tone while providing maximum attack and articulation. Length: 16 3/4" Head Size: 1.42 x 1.38". The newly revised design features slightly longer handles and is a little lighter when compared to the original design. Improved mallet balance and feel, while maintaining the enhanced sound and projection that performers have come to expect from the series. All Promark drumsticks are designed and manufactured in the USA to the most stringent quality controls in the industry. .