Made in Yokokomo, perfect for big bore shocks. Introducing an O-ring for shocks. The O-ring is complete to maximize the damper performance that controls the movement of the suspension which is important for RC drifting. Made from the ground up with revised materials and dimensions, this O-ring allows for smooth movement of the shock shaft, while providing excellent sealing performance to minimize oil leakage. Of course, it is compatible with the [RT-012 SPM Titanium Shock Shaft]. We recommend using it together. In addition, the RT-012 SPM Titanium Shock Shaft is not recommended for AXON shocks but can be used with this O-ring. This O-ring is only for silicone oil. Please note that this product cannot be used with mineral oils.