Considerations: Selecting the brass, copper, and polycarbonate bottom cases will slightly alter the acoustic properties of the keyboard. Brass and copper will also substantially increase the weight of the keyboard. Polycarbonate is lighter and also generally allows for more resonance than aluminum.

Black: Anodized aluminum
Bluegray: Anodized aluminum
Maroon: Anodized aluminum
Blue: Anodized aluminum
Lilac: Anodized aluminum
White: Electrophoresis-coated aluminum
Polycarbonate: CNC-machined and sandblasted clear polycarbonate
Brass: Sandblasted and clear-coated brass
Copper - Sandblasted and clear-coated copper
Silver Mirror - Polished electroplated brass