Unpainted spring that maximizes the characteristics of steel material. The progressive type is designed for competitive rides, where the pitch changes from mid-roll is consistent in rough areas, while the multi-winding section provides a soft traction traction traction traction and a smooth slide when used on the rear and a mild steering response when used in the front. In addition, the rebound stroke can be used flexibly in the movement of the roll and uneven road surfaces, so you can ride with a level of ground up. The total length is 1.0 inches (26.5 mm), but the total length is 1.1 inches (28 mm) to make it easier to maintain the height of the car. The linear wound Φ0.06 inch (1.5 mm) spring is especially suitable for the front and can increase the steering response. Even if the steering gyro has been improved with a turnback or other methods, it is highly responsive to your hands.