AP Racing by Essex 2-piece Competition J Hook Disc Pair (Front 410x36mm)- Porsche 991.1 & 991.2 GT3, GT3RS PCCBAP Racing by Essex 2 piece Competition J Hook front iron disc pair for 991. 1 & 991. 2 GT3 & GT3 RS to replace PCCB discs. 16. 14" x 1. 40" (410mm x 36mm) Huge increase in airflow, cooling capacity, and durability vs. OEM PCCB discs Drastically less expense long term running costs vs. PCCB Must use the standard front 991 GT3 RS pad shape used in OEM iron system (not compatible with OE PCCB pad shape) Over twice as many internal cooling vanes as the