Clarks Clout 1 hydraulic disc brake set, both front 180mm and rear 160mm. Very well reviewed brakes with very nice rotors. Please note this is European spec set so the front brake is the left brake lever and the rear brake is the right brake lever. If you wish to change this you will need to disconnect the cables and swop them so will need to have mineral oil available to top up. A 180mm front rotor provides greater stopping power on the front great for downhill descents where more pressure in on the front wheel and also the rotor will not get as hot so less brake fade. The 160mm rear will give you a little more modulation and fine control of braking. A 180mm front and 160mm rear combination is often a recommended combination and fitted to mid-range mountain bikes. International Standard mounting (best mounting as no threads on the frame or fork to get damaged). Please note this is supplied as two retail boxes, one front and one rear rather than both sets combined in one box. This can be clearly seen in the images. Thanks for looking.