These high-quality blades are made of flexible stainless steel, so they will flex before they break. This ability acts as a warning. When you see the blade start to flex, you know it is time to back-off and decrease the amount of pressure. The blades are flat on one side so they will ride against the glass and cut the urethane at the point of least resistance. These features have made Equalizer® Talons™ the most used oscillating blades in the world.