Today there is a demand for models targeted for very specific excerpts, as well as a movement toward lighter, smaller heads for certain applications. There is no greater expert on orchestral keyboard repertoire than William James, principal percussionist of the St. Louis Symphony. Will has expanded the original OR line into a vast selection of sounds and tone colors, with many different materials, weights, sizes and handle types.
https://malletech.com/mallet-series/new-orchestral-series/