AP Racing by Essex 2-piece Competition J Hook Disc Pair (Front 350x34mm) for Porsche frontAP Racing by Essex 2 piece Competition J Hook disc pair for Porsche front. 13. 78" x 1. 4" (350mm x 34mm) 72 Vane, D66 radial depth Huge increase in airflow, cooling capacity, and durability vs. OEM Designed for: club racing, time trial, autocross, HPDE Works with OEM calipers, no modifications required Ultralight, fully floating, anodized billet aluminum hat with float control anti rattle clips Patented Disc Burnishing Bedding Service Pair $150 AP