The ZeroRC RW-OP-11-1 is a specialized Optional Spring Set specifically designed for the shock absorbers on the RW00 and RW00SR 1/24 drift chassis. 
 
Kit Contents & Specifications:
 
This set is a comprehensive tuning package for micro-drifting, typically containing 18 pieces: 
Three Hardness Tiers: Springs are color-coded to allow for quick identification and adjustment based on track surfaces (e.g., P-tile or carpet):
Pink: Soft
Green: Medium
Yellow: Hard
Three Length Variations: Each hardness level includes three different lengths to facilitate diverse pre-load and ride height configurations.
Diameter: Specifically sized to fit ZeroRC's 6mm metal shock absorbers. 
Performance Impact
As part of the SP.SPEC (Special Specification) series, these springs support ZeroRC's core tuning philosophy: 
Balanced Speed: Fine-tuning the front and rear spring rates helps achieve a balance between rotation speed when entering and exiting a corner.
Cornering Power: Adjusting the stiffness allows drivers to enhance acceleration capability within a drift and the strength of acceleration on exit.