One model covers all instruments... all ages... all sizes!!! This chair is ideal for Playing OR Directing! From a low crouch to a standing position, the seat height can be adjusted to 12 levels (13? to 33.5?, 2? steps) by removing theseat and hooking it to the horizontal bars located on the chair frame. This means you can easily adjust your seat height according to your needs. A single IMS Chair can guarantee the optimum playing posture anytime, ...