Some Applicationsrequire moretraditional friction materials TF4650BXE is a traditional resin/fiberglas-based material. TF202AF is a modern injection molded composite. TF4650BXE COMING SOON TF202AFCOMING SOON No backing plate required in most clutch applications;Manufactured in an ISO 9001-registered facility. Download TF4650BXE Spec Sheet Here Download TF1700 Spec Sheet Here