Description This is Novaks Ballistic Replacement Wound Stators -- 3.5T-21.5T (#S6603-#S6621). Each Ballistic motor features interchangeable wound stator construction. By unscrewing the main screws, the motors’ solder tab and sensor assemblies can be easily removed to leave only the stator, which can be replaced with six motor wind options. These replaceable hand-wound stators create countless racing options for racers looking for a cost effective way to change a motors turn count.