Nexx Racing's Optional/Replacement CNC'd, Stainless Steel, BALL DIFFERENTIAL SHAFT is EXCELLENT! Super tight tolerances! Super strong, light, durable and dependable, as well as beautiful. An absolute great replacement for most ball diffs. Made of stainless steel! NX-127 Spur, NX-152 pressure plates & NX-139 Ceramic diff balls highly recommended! * This axle shaft is 4mm longer than a standard shaft