Titanium case with hardening coating to 1000 vickers, screw down crown, 20 layers of X1 grade Super-LumiNova, 8.5mm thickness, drilled lugs, Ronda 6004.D movement, and a full 16 layers of AR coating on the sapphire crystal. The ARK leaves little to be desired in a field watch weighing in at just 34 grams.