Promark Jeff Moore JM13 Medium Hard Birch Marimba Mallet The JM13 is a great mallet for the mid range of a marimba, this mallet is a great all-purpose choice Length: 16 5/8" Head Size: 1.38 x 1.75" The JM13's 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