The Mike Balter Basics BB8 Medium Rubber Birch Keyboard Mallets can be used on either marimba or xylophone and are designed to provide the student and band program with an economically developed solution for obtaining mallets. With exceptional quality at an affordable price, this color-coded series has a model for every percussion situation. Balter Basics come with moderately thicker birch handles for more control and durability. Blue Rubber Hardness: Medium Head Diameter: 1 1/4" Overall Length: 16 1/8"