These are titanium...

 

The description says Grade 23 which I have no idea about:

Large Model: 42.50mm x 13.7mm - Grade 23 titanium case - bidirectional titanium bezel with black ceramic insert - sapphire crystals front and caseback - 30m water-resistant - matte green dial with beige luminous accents - tachymeter scale - Calibre F388B, in-house, automatic hi-beat integrated flyback chronograph with column-wheel and vertical clutch, 5Hz frequency, silicon balance and silicon balance-spring, 50h power reserve - leather strap with folding clasp (pin buckle also available) - limited to 200 pieces - CHF 20,100 

Small Model: 36.2mm x 11.50mm - Grade 23 titanium case - bidirectional titanium bezel with black ceramic insert - sapphire crystals front and caseback - 30m water-resistant - matte green dial with beige luminous accents - tachymeter scale - Calibre F188B, in-house, integrated flyback chronograph with column-wheel and vertical clutch, 3Hz frequency, silicon balance spring, 40h power reserve - leather strap with folding clasp - limited to 100 pieces - CHF 18,900

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