?Aluminium Alloy Construction & Note?-- Made of aluminium alloy material brake arm that equipped with wear-resistant rubber brake pads, anti-rust and sturdy, making it resistant to collision and not easily deformed to ensure long time use. Please make sure the specification needed before you purchase. ?Provide Strong Braking Power?-- This bike brake features dual sided actuation that forces the pads to produce equal clamping force in dry and wet conditions. ?Keep Riding Stable?-- The grooves on the rubber pads can improve braking efficacy and provide smooth operation to make cycling safer. ?Brake Dimension & Widely Used?-- The length between brake rubber measures 3.9"/10mm. With longer screw shaft is front brake caliper, with shorter screw shaft is rear brake caliper. Great replacement set for road bike, folding bicycle to provide a smooth braking performance or bringing the bike to a stop. ?Package Included?-- Pack of 1 pairs bike brake including 1 x front brake caliper, 1 x rear brake caliper.