The Shimano PD-R8000 Ultegra SPD-SL +4mm Longer Axle pedals features a lightweight carbon-composite body with an extra-wide platform for a more efficient transfer of power. A durable stainless steel body plate reduces flex and pedal body wear. A few other key features include adjustable entry and release tension settings, a 4 mm longer axle and wide bearing placement for stable, uniform load distribution.