The CK and K are Moog's Premium line of control arms. The CK series control arms include Problem Solver components for better performance than an OE upgrade. Moog Control Arms use Problem Solver Technology to address common factory issues better than the original replacement for your vehicle. Most CK and K Problem Solver Control Arms with the ball joint are made of powder-coated metal with gusher bearings, providing extra strength, durability, and long-lasting performance. The ball joints have grease fittings and are serviceable. The CK and K arms also have problem-solving bushings and a precise fit and form for easy installation. They are precision-engineered, tested and manufactured for heavier loads and uneven roads. Moog offers high utilization control arm designs to meet performance needs.