Overview: This is a Rear Spring Assortment for 6359-01 PowerStroke Rear Shocks. Take your 6359-01 ARRMA® PowerStroke Shocks to the next level by tuning them to match your specific needs with the optional Dual-Rate Rear Spring Assortment pack! Mix and match the different upper and lower spring rates to dial in your suspension to the conditions. The 3 different upper and lower rates allow for 9 different combined spring rate options. Get your pack of optional springs today! Fits: 6359-01 Pro-Line Rear PowerStroke Shocks for ARRMA® 3S and 4S vehicles ©2020 Pro-Line Racing. ARRMA®, Kraton™, Outcast™, Senton™, Typhon™ and Granite™ are trademarks or registered trademarks of Horizon Hobby®, LLC. All other trademarks, service marks and logos are property of their respective owners.