They are two-coloured, with casein paint made from a chalk base: outside, dark green, inside, bolus red. The instruments sit on an oak stand with four (Delin and Ruckers) or twelve (Dulcken) turned legs. Instead of the four-leg stand, a decorative stand made from massive oak and with eight turned legs is optional. The panelling on the lid and on the outer case can also be gilt to order (23.5 carat gold inlay). The keyboards are covered with ebony with the possibility of a bone covering. The non-altered Ruckers instruments include the bone covering as standard.

Virginal after Ioannes Ruckers 1629   8' C/E-d'''
Harpsichord after Andreas Ruckers 1637   8'4' C/E-c'''
Harpsichord after Ioannes Ruckers 1638, two-pitch-instrument, double-manual   8'4'8'4' C/E-f'''
Harpsichord after Ioannes Ruckers 1624, petit ravalement, double-manual   8'4'8' GG,AA-d'''
Harpsichord after Ruckers, grand ravalement, double-manual   8'4'8' FF-f'''
Harpsichord after Albert Delin 1750   8'8' C-e'''
Harpsichord after Albert Delin 1768   8'8' GG-e'''
Harpsichord after Johann Daniel Dulcken 1747   8'4'8' FF-f'''
Harpsichord after Johann Daniel Dulcken 1745, double-manual   8'4'8' FF-f'''