VSR Pro 10™ Black Diamond Traction Magnets are the strongest compression molded traction magnets you can get at an affordable price. Pro 10™ magnets are designed with speed and handling in mind. These magnets are typically used for modified racing and VSR recommends using performance armature and aftermarket track power supply for best results These are designed to fit the Super G+ chassis. These can also be used in the Viper V1 with the use of an additional spacer .060 on top of the magnet. Please note, rear end may need to be widened to allow clearance for magnets.