This Yokomo Rwd Drift Spring Set has been developed for the fine tuning of your chassis to fit a surface type and track layout suited for drifting. With six different options, two for the front and four for the rear, it is easy to adjust your drift car to suit carpet, asphalt, concrete and other road surfaces. Due to the special characteristics of the material used to make them, the springs have not been coated or any treatment added to keep the springs at their original performance. Over time this may cause some discoloration on the spring edges and surface. To prevent discoloration please lightly oil them with some bearing or machine oil.