What's in the box:

Bike Calipers Set Front Rear Bike Disc Brake Kit Metal MTB Road Bike Cyling Bicycle Parts

Metal construction make the brakes with great resistance, do not worry about the braking force with little mud and dust on it after long time use but you are supposed to have it cleaned after some time to keep better performance.

Features:
Metal disc brake with great wear resistance for long time use.
Still keep great braking force with little mud and dust on it after long time use.
Adjusted brake compatible with kinds of bike like MTB bike, road bike and so on.
Ball driven disc brake increase the stability of use.
A great choice of bike refit parts.

Specification:
Material: Aluminum alloy
Size: 7.5 * 5cm / 3.0 * 2.0in
Weight: F188g-6.6oz / R190g-6.7oz
Package weight: 382g / 13.5oz
Package size: 11 * 11 * 5cm / 4.3 * 4.3 * 2.0in

Package list:
1 * Front Disc Brake
1 * Rear Disc Brake