Major advantages of upgrading to this product: 1. Aluminum 6061 T6 is light material with high tensile strength for long-lasting durability during extreme RC action. The products are also anodized in our singature scratch resistant vibrant alluring colors. 2. Delrin collars are designed and hand installed to eliminate the gap, friction with the friction causing parts, so that the handling performance is top rated and in harmony with the rest of the vehicle.