* Satin silver anodized finish. The outermost ring comes with pickup pins. For smoothest shifting we recommend keeping the outer ring no more than 14 teeth bigger than the inner ring. * The 38, 43, 45 tooth rings are inner chain rings for two ring cranks. 46 tooth and larger rings are outer chain rings for two or three ring cranks. Designed for use with 8,9,10 speed Shimano drive trains. * Machined from 7000 series aluminum alloy. 130 mm bolt circle diameter. Excellent quality and beautifully finished. Made in France.