Pure silicone oil for use in Shock Absorbers. Every grade is precision matched to give correct damping performance time after time. Silicone oils also have low viscosity change with temperature to maintain consistant performance. Heavier grades with higher numbers will give more damping and less body roll while preventing the chassis from grounding out after big jumps. Lighter grades with lower numbers will give more traction and a smoother ride but body roll will increase and chassis may ground when landing off jumps.