Kratos compound for dirtier and prolonged braking situations, think massive descents and constant speed management Bia compound for rides where braking isn't a constant. Instanton performance means you're always ready to reign in your speed a little or a lot These disc brake pads feature a exclusive Ceramic Barrier technology designed to keep the heat where it belongs, on the pads, not the rest of the system Made with 100% nontoxic recyclable material so you can feel good about protecting the trails you love Nickel and leadfree