Hayes Disc Brake Pads Sintered-Metallic HFX, 9, Mag, MX1, G2Hayes Disc Brake Pads Sintered Metallic HFX, 9, Mag, MX1, G2 Hayes Semi Metallic Disc Brake Pads. Disc brakes can make noise in some conditions. This material eliminates, or reduces squeaks and squealing. Better modulation. This means you get a "softer" feel at the lever when you brake. Braking power is progressive and consistent throughout each stop. Provide a high level of stopping power. Includes 2 pad springs, outer and inner pad Heat Sink: No Pad