The three models of the Kevin Bobo series are grouped closely together, spanning just hardness level 8 to 14. This particular mallet is the medium model. They are wound very tightly with an extremely durable, thin nylon yarn. They produce a deep, consistent tone throughout a wide dynamic range while producing clear articulation even at very low dynamic levels. They also feature a birch handle for added durability and comfort. Get your Malletech KB11 Kevin Bobo Marimba Mallets today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.