King's Racing Line XPG Tri-Metal Main Bearings are designed for high load, long duration racing events. The bearings feature an enhanced tri-metal copper lead construction with nickel barrier and SecureBond adhesion. These bearings are able to handle 15% - 30% greater load capacity than traditional bearings. The SecureBond's unique adhesion process offers superior stability between the top and intermediate layers. The bearings also feature 0.0005" metallurgically enhanced and hardened performance overlay that withstands greater loads and is able to better resist surface fatigue.