4 Pairs Hayes HFX9 HFX MAG Mag9 MX1 Hayes9 CERAMIC Pro Disc Brake Pads MTB XC DH Brand: DiscoBrakes Soft Ceramic Pro Organic Pads with Spring(s) included 4 Pairs of Disc Brake Pads (8 pads + 4 springs) Ceramic Fiber insulates brake system from friction heat Ceramic Fiber reduces damage to rotor