The AFAM 520 SPROCKET AND CHAIN KIT - QUICK ACCELERATION includes:

One Front and One Rear sprocket:

• Front is a precision-machined, heat-treated, steel sprocket with one less tooth versus stock.
• Rear is a precision-machined, heat-treated, 7075-T6 aluminum sprocket with one more tooth versus stock.

And following chain:

D.I.D. 520 ERV3:

• High-performance, lightweight, low-friction X-ring chain designed exclusively for racing.
• Pins for ER chains are put through a patented heat-treatment process that produces a surface 1.5 times harder than conventional carbon heat treating.
• Chain has gold plates and comes supplied with a rivet style master link.
• Used by most factory race teams worldwide.