The ZeroRC SR-OP-9 is a specialized Long & Short Shock Absorber Set (frequently referred to as the Mixed Travel Shock Kit) designed for the RW00SR 1/24 drift chassis. This kit provides a hybrid setup, typically including two long shocks and two short shocks to allow for asymmetrical suspension tuning between the front and rear of the vehicle. 
 
Key Features & Application:
 
The SR-OP-9 kit is designed for drivers who want to mix the benefits of both the SR-OP-7 (Short Shocks) and SR-OP-8 (Long Shocks) on a single chassis:
Asymmetrical Tuning: Most commonly, the short shocks are used in the front to maintain a low profile and sharp steering response, while the long shocks are used in the rear to maximize weight transfer and rear-end traction during acceleration.
Mixed Travel Design: This configuration is ideal for "raked" setups where the rear of the car needs more travel to "squat" into corners, a popular choice for high-traction surfaces like carpet.
CNC Construction: Like other ZeroRC OP parts, these feature precision-machined aluminum bodies with high-sealing gaskets to maintain consistent oil damping.