Packaging Includes: Damper-2pcs Black spring-2pcs Round head screws 2*10-2pcs Part Location: Front or rear damper area Does this product replace a specific part or function? Yes Product major function & usage: Reduce the friction and absorb the pressure during driving so that the car can be more balanced. Is this part adjustable? If yes ¡K how and why/purpose? How: Adjust the top spring retainer. Purpose: To adjust the hardness of the spring damper. Major advantages of upgrading to this product: (1) Aluminum 6061-T6 shock cylinder and sealed shock cap, stainless steel shock pin, sturdy and durable, with good resistance effect (2) The wire diameter of the silver spring installed on the shock absorber is the same as the original, and the black spring is for replacement. Suitable Model: KYOSHO-1/18 4WD MINI-Z 4X4 SUZUKI JIMNY SIERRA APIO JIMNY TS4-32525