All part numbers in the Ferodo racing range feature a suffix that identifies the material compound available for each part number. Many part numbers are available in more than one material and are listed accordingly in Federal-Mogul catalogs with different suffixes. See below:

• H DS2500
• C 4003
• R DS3000
• M DS3000 Plus 03 
• E DS3000 Endurance
• W DS1.11
• X DS2.11

Here’s an example:
FRP3001H = DS2500, FRP3001C = 4003, FRP3001R = DS3000, FRP3001E = DS3000 Endurance