Together at last! Pro-Line’s latest in 40 series spinning technology combined with the world class Weld Racing licensed Velocity 6 chrome wheels. Super-tough and ultra-smooth chrome wheels, coupled with the ultimate durability of 6061 polished aluminum spinners, these 40 Series performance accessories are number one priority when it comes to the aftermarket segment of R/C. The 40 Series Spinners represent the latest craze in wheel add-on styling. Two ball bearings allow the spinners to rotate separately from the wheel. Each spinner is hand polished and machined using the latest tooling technology.