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A carbon kevlar compound made to last a bit longer than the original R-4 compound. The R4-E compound is designed to endure higher prolonged temperature and still has pad life as long or longer than Porterfield R-4 do. This pad is great for club enduro events and applications where temperatures are at their maximum.
Excellent bite at the track. Got these super hot at a track day and they grab hard with no brake fade. My old Auto X pads faded at the track, but not these. Not for street or Auto X use, they are super noisy and dusty on the street. You need to do about 2-4 hard braking stomps to warm them up for full friction. They work about as good as OEM cold, but are squeaky.