The ACE AF1 features game-changing performance without deviating from our original Ace geometry. The AF1 is carefully manufactured using our proprietary casting process. Years in development, the ACE AF1 has a 70% increase in the aluminums structural integrity, making it the strongest and longest lasting cast truck on the market. Specs Manufactured with high-quality AA 356.2 alloy using our own proprietary casting method True T6 heat-treated baseplates and hangers SAE 4140 steel alloy axles, oversized to eliminate bearing wobble. Patent pending rethreading axle nuts – no more damaged axle ends! Durable Hand-poured 96a urethane pivot bushings for better response. Refined suspension for a cleaner turn. Top Bushing: 12mm tall | 91a hardness Bottom Bushing: Bottom 14mm tall | 86a hardness Machine-faced hanger ends for precise bearing contact. Each truck includes bonus red Axle Re-Theader Die