These are the Aztec Organic Disc Brake Pads for Tektro Lyra Mechanical Callipers. Organic compound replacement disc brake pads for Tektro Lyra Mechanical Callipers. Race tested pads giving you the latest braking compound technology. Manufactured and tested to the highest standards. Good braking power even in the most adverse weather and trail conditions. Ideal for everyday use on and off road. Stiff and corrosion resistant backing plate.