From thebikebiz.com: "The Miche Primato Pista Hubs come in both a low and high flange and are made of forged aluminum alloy with sealed bearings. The finish is a brushed polished that is lightly anodized and comes in 28, 32 and 36 hole drillings. Both the front and rear are a solid axle 9X1 front / 10X1 rear with chrome plated axle nuts and comes with a chrome plated lockring. The high flange weighs in at 520 grams plus 100 grams for the locknuts."