Traxxas X-Maxx GTX Natural Finish 1.538 Rate Shock SpringsTraxxas optional GTX springs let you tune your X Maxx for different conditions. The higher the spring rate, the stiffer the spring. Stock X Maxx spring rate is 1. 055. Sold in pairs. Use Traxxas stock and hop up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's