The SU13R provides A brighter, more articulate sound than aluminum or plastic and are perfect as a general metallic ensemble mallet. Spur is a collaboration with world-renowned percussionists, designers and educators Kevin shah and tony Nunez. Designed with the educator in mind, the spyr series features a full suite of mallets that cover the complete spectrum of sounds required on keyboard instruments for the variety of ensembles and performances that educators lead. No more need for multiple mallet lines to outfit your different ensembles. With spyr, we've got you covered.