With the RM 21-01, Richard Mille presents a new case design. The complex structure of the case in 5N red gold is reinforced with an exoskeleton in Carbon TPT®, used for the bezel and pillars. This extremely light and durable composite is made by stacking hundreds of layers of carbon fibres thanks to an automated process that rotates 45° between each layer, then heated to 120° in an autoclave before being machined to the nearest micron. Just like armour, these reinforcements perfectly protect the case, and are firmly held in place by 20 spline screws. The striking appearance of Carbon TPT® layers perfectly complements the gleam of gold and the royal blue honeycombed motif of the baseplate. This new RM 21-01 Tourbillon Aerodyne is issued in a limited edition of 50 watches.