Features: - Fits Chain Size520 - Outlast and outperform the competition with ProTaper front sprockets! - They are precision-broached and machined from case-hardened Chromoly steel to the strictest standards. - These sprockets feature self-cleaning mud grooves to prevent dirt and mud build-up, along with lightening holes that reduce sprocket weight. - ProTaper front sprockets have a special wear-resistant coating that helps to retain strength and durability, with an etched tooth number for easy identification. What's in the box 1 x ProTaper Front Sprocket.