EBC Part Code: USR1517. EBC USR Grooved Discs are manufactured and machined using a high-quality alloy, designed to run up to 900 degrees centigrade (glowing red hot). Combine these EBC USR Slotted discs with EBC GreenStuff, RedStuff (Ceramic) or YellowStuff pads to increase braking efficiency and reduce stopping distances even more!