Borrowing technology from Renthal"s championship winning motocross sprockets, they have designed and developed these chainrings to offer a combination of lightness, strength and durability. Renthal Ultralite chainrings are designed to let you ride faster, jump further and last longer. High strength 7075-T6 aluminum alloy provides excellent longevityPrecision CNC machined to extremely tight tolerancesChain ring is NOT rampedHard anodized surface coating for increased longevity Item SpecificationsColorGoldMaterialAluminumTeeth33teethBolt Pattern4-BoltChainring BCD104mmRing PositionSingleChain Compatibility9-Speed,3/32"Defined ColorGold