This is an Arces Triple Plate Set for 35 mm  Front Forks as used on various Laverda models like the 650, 750 GT S SF and other Italian bikes of the period as Aermacchi, Benelli Ducati Bevel Single 250 350 450, motorcross  etc. Arces is the same as Ceriani from the same factory. Original painted grey but can be polished or repainted. Nice state, see pictures.   . 

Ducati roundcase, Imola, Greenframe, SS, SD, GTS, MHR, SSD, Darmah, squarecase, S2, sport, supersport, Borrani, Ceriani, Scarab, Lockheed, Marzocchi, Brembo, monza , diana, mach, mach1, dm250, dm350, dm160, 160, 450, dm450, desmo, desmodromica, elite, elite 200, brembo, 900SD, Mark 3 , mark 2, CEV, 750, 750GT, 860GT, 900GT, MV Agusta 750 America GT SS