Limited edition of100 piecesr the graham chronofighter oversize superlight tt functions of chronograph seconds 30 minutes counter date at 8 oclock hours minutes seconds case is 47 mm superlight black carbon nanotube composite case 51g total weight of the watch is under 100g black carbon left fast action startstop trigger and black rubber reset pusher black ceramic bezel domed sapphire crystal anti reflective coating on both faces see through sapphire crystal case back with is