Razor MX350 Disc Brake Adapter. This adapter will allow you to run a disc brake caliper on a Razor MX350. Set to a 140mm disc so you can run any size up from that. ***LIFETIME WARRANTY*** The original made in America not a knockoff made in China copy with no knowledge of what they are selling you. We have invested years of R&D into what we make. We personally use, ride and trust the products we make and that’s why we offer them to you. We are here for any installation questions or bike and parts compatibility. We ship your order within two days of receiving it no waiting weeks for international copycats.