BLADETECH Lightspeed Edge Burner Stainless Steel Runners feature a unique blade design – the front portion of the replacement skate blades flex up into the holder of your skates, store the vertical energy, and then release it when you extend your stride. Through this innovation, Bauer aims to help increase your acceleration and help you skate up to an average of 5% faster. Further, the Lightspeed Edge Burner Stainless Steel Runners help reduce lower body injuries thanks to the flex of the blade into the holder, it absorbs the large-impact forces while skating & reduces pressure on the ankles, knees, and hip joints.