The product has been used for two years. The effects seem to last almost indefinitely. While using it, you'll immediately notice improved fuel efficiency and that the car is less likely to get dirty, so I recommend it. m+ FRICTION FREE MODULE 10-LAYER The m+ FRICTION FREE MODULE 10-LAYER is a product that reduces friction generated while the vehicle is running, making driving more comfortable. It is an upgraded model of the m+ FRICTION FREE MODULE 4-LAYER, which is currently on sale. The engine runs smoothly, low-speed performance improves, and the ride becomes more comfortable. It also keeps the vehicle and equipment clean, making it less likely to get dirty. Furthermore, it reduces fatigue during long-distance driving and long hours of driving, enabling safe, comfortable, and enjoyable travel. It is a product that improves not only driving performance but also sensory and comfort performance.