HERE WE HAVE A PROSLOT GROUP 20,(.513 DIA-42 DEGREES OF TIMING)-ARM IS BALANCED),IT HAS BALL BEARINGS ON BOTH ENDS(GRW), THE MAGNETS ARE PROSLOT MEGATRON 3s WHICH ARE VERY POWERFUL AND A GREAT MATCH FOR THIS HIGH POWERED ARM !! ,ALSO KOFORD BRASS SPRING CUPS AND CONDUCTIVE SPRINGS SO YOU WONT HAVE TO SHUNT THIS MOTOR ITS HOT AND READY TO RUN/WIN,ALL HARDWARE AND BEARINGS HAVE BEEN ALIGNED AND TRUED AND ALL SCREWS HAVE BEEN MEDIUM LOCTITED IN PLACE SO THEY WONT VIBRATE OUT !!!!!! THIS MOTOR IS HOT AND A REAL ZINGER,READY TO WIN RACES !!!  ALSO IF YOU NEED ME TO BUILD YOU A MOTOR,CAR OR CHASSIE SEND ME AN EMAIL !!!!