This is a Muc-Off disc brake protection cover. It's a cover designed to protect disc rotors and calipers during cleaning, maintenance, and transportation of bikes equipped with disc brake systems. It has a two-layer construction: a cushioned layer on the front and a slotted layer on the back. The outer edge has Velcro, allowing it to wrap snugly around the entire brake system by passing it through the frame. This prevents accidental contamination of the rotor during lubrication during cleaning, and also eliminates the worry of damaging the disc rotor, the interior of a vehicle, or the frame during transport. With a diameter of 31cm or more, it's compatible with large rotors. Recommended for those who frequently transport their bikes for races, or for those who often maintain cyclocross or off-road bikes. This product is a front and rear pair set. Shipping will be on the same day or the next morning. #mucoff #macoff #bike transport #maintenance #roadbike #cyclocross #gravelroad #gravelbike #discbrake