The marimba one 3100™ is by far the most rigid and durable and rigid marimba on the market. The end frames have more wood than our Izzy™frame and we laser engrave tape measures into the end frames so you always know the keyboard height. To raise and lower the marimba, simply turn a handle at each end frame. You can choose to have our all wood rails or our new black aluminum-and-wood rails. 100% designed and built in our California factory.