This Yamaha concert tom set features 13", 14", 15", and 16" single-headed toms with two medium-weight double tom stands. The drum shells are 8-ply birch/mahogany. Birch provides attack and clarity, while the mahogany provides warmth and fullness of sound. These concert tom drums are constructed using the Yamaha Air Seal System to produce a quality drum and to achieve the distinct Yamaha sound. This process ensures that shells start round and stay round; an in-round shell tunes clearer and provides a pure fundamental tone. Yamaha's concert tom system come with two WS-850 heavy-duty stands. The stands feature double braced legs for stability.