Clarks Organic Disc Brake Pads For Hayes Sole/Gx-2/Mx (2/3/4)Description: Clarks: Specifically designed to give the best performance under normal conditions. The organic compound gives improved noise reduction as well as increased ‘bite&rsquo.Recommended for use with Mechanical Systems.Compatibility - Hayes Sole GX-2 MX1 MX2 MX3 MX4.