Press Release From SMJ Racing:
www.smj-rc.com
SMJ has released shock spacers you place above or below the shock spring to improve grip and traction. These spacers allow for fine adjustment of grip without changing the shock spring. Type A is the aggressive type with excellent response. Type M is a mild type.
Product number: SMJ1349
HIGH TRACTION SHOCK SPRING SPACER TYPE-A (4pcs)
https://smj-rc.com/products-2/general-purpose-item/general-purpose-products-for-ep-cars/smj1349?lang=en
Product number: SMJ1350
HIGH TRACTION SHOCK SPRING SPACER TYPE-M (4pcs)
https://smj-rc.com/products-2/general-purpose-item/general-purpose-products-for-ep-cars/smj1350?lang=en