RRP RX4 Delrin Rear Bulkhead Set - RRP-020 Fits: RRP RX4 (Yokomo MX4 Worlds Prototype)Material: Delrin. Strong and durable material worthy of use on race, and shelf queen builds. RRP RX4 Delrin Rear Bulkhead Set RRP-020SKU: RRP-020$55.00PriceQuantityAdd to Cart