The One DISC 3.0 for hydraulic brakes feature a steel base and are made of an organic blend. Suitable for hydraulic disc brakes: Shimano Deore M575, M525, M515, M506, M495, M486, M485, M475, M466, M465, M447, M446, M445, M416, M415, M395, M375, Nexave C501, C601, RST D-power, Tektro Aquila, Draco, Auriga, Gemini, Orion, Dorado, HDC, TRP Hylex, HYRD, Spyre, Giant MPH Root.