Copper melted/pressure formed with flux and friction modifiers. The most agressive pad compound. Even higher fade resistance and longevity, but even more squeal and wear.
Shimano - most SLX, XT and XTR calipers.
M615, M666, M675, M785, M985, M987, M988, M6000,
M7000, M8000, M9000, M9020, R315, R515, R785, RS785, S700
FSA K-Force DB-XC9000, Afterburner DB-XC-9150