The Bistone is hand made in Italy by Ettore Ferro. Each serie has an own serial number from 1 to 10 on the rim. The Bistone is made out of one piece aluminium. It doesn't have a bearing or axle. The Bistone knows two different editions: Black Hole Version just made 30 pieces, and the Clock Version just made 50 pieces.
BISTONE - Imperial shape - Just 54,6 grams (weight) - 28,10 mm (Width) - 3,05 mm (Gap width) - 54,05 mm (Diameter) - No bearing or axle - Fixed Gap - Half Dif-e-yo Pad