Our intricate double tourbillon calibre is protected by highly-resistant Cobalt Chrome, an alloy rarely used in watchmaking. As always with Roger Dubuis, the choice of this material also benefits the aesthetics. Therefore, the silvery-grey colour of this innovative material is associated with a deep blue, inspired by the colour of cobalt in nature, to create a striking yet refined contrast.Our first Double Tourbillon in 2005 ingeniously linked two tourbillons with a regulating differential. Since that pioneering moment, our Double Tourbillon creations have continued to evolve. This new edition has perfected the technique, with 319 components and two flying tourbillons that are once again linked by a differential. In addition to its distinctive brightness, Cobalt Chrome is highly resistant to scratches and corrosion and is non-magnetic, making it reliable in everyday use. Originally used in cutting-edge industries, Roger Dubuis has been incorporating Cobalt Chrome into its watches since 2017, making it one of the Maison's signature materials. The RD108SQ Calibre is optimized with 72 hours of power reserve. To resist surrounding forces, the flying tourbillons include an upper cage in non-magnetic Cobalt Chrome, and a lower cage in titanium – also non-magnetic and twice lighter than steel.Case Cobalt CarTech Micro-Melt BioDur CCMTM case with open case back Sapphire crystal Size: 45mm Water Resistance: 10 bar (100 m) Dial Blue CVD coated double surface flange, satin-brushed, with transferred minute track and texts, polished and rhodium plated hour markers with SLN in the center. Main material: Cobalt Strap According to our non-exotic policy, Excalibur collection is adorned with a premium calf leather strap, interchangeable thanks to Quick Release System. Type: Calf Color: Blue Clasp Titanium cover with titanium triple folding buckle interchangeable with Quick Release System - QRS Type: Titanium MOVEMENT Energy: Manual-winding Indications: Hour - Minute Power reserve: 72 Hours Decor Shot-blasted, trued-up or circular-grained main plate and bridge with NAC coating Technical Details Number of pieces: 319 Number of rubis: 32 Diameter: 16 3/4 Thickness: 7.35 mm Frequency: 21600 Frequency (vph)