BRAND NEW-NEVER USED OR REMOVED FROM THE PACKAGE. THIS IS 1 12-TOOTH ERGAL LIGHTWEIGHT RACING PINION GEAR USED FOR SIDEWINDER MOTOR CONFIGURATIONS AND ARE MEANT TO BE PRESSED ON THE MOTOR SHAFT. IT IS RECOMMENDED THAT YOU PRESS THE BRASS PINION ON USING A GEAR PRESS LIKE THAT FROM PARMA (LISTED AS 1/32 GEAR PRESS 516 PRESS AND 515 PULLER IN OUR EBAY STORE). YOU CAN USE A VICE TO PRESS THE GEAR ON IF NECESSARY BUT HAVING THE GEAR PULLER AND GEAR PRESS WILL COME IN HANDY OVER AND OVER AGAIN. THE GEAR IS 6.5mm ON THE OUTSIDE DIAMETER AND IS MEANT TO BE USED ON ALL FLY, SCALEXTRIC, NINCO, AND OTHER SLOT CAR MANUFACTURERS CARS THAT ARE SIDEWINDER MOTOR CONFIGURATIONS (EXAMPLE -SCALEXTRIC OR FLY GT40'S). INLINE MOTOR CONFIGURATIONS USE THE 5.5mm OUTSIDE DIAMETER PINION GEAR. IT WILL ALSO FIT HIGH PERFORMANCE MOTORS FROM MRRC, FALCON AND OTHERS. OFTEN THE STOCK WHEELS AND GEARS HAVE EXCESSIVE PLAY AND CANNOT HANDLE HEAVY STOP AND GO USAGE. SLOT-IT PARTS ARE HEAVY DUTY AND WERE DEVELOPED FOR HIGH PERFORMANCE AND ENDURANCE USAGE AS WELL AS GIVING A SMOOTH AND PRECISE DRIVE TRAIN. THE PARTS ARE OF THE HIGHEST QUALITY AND BEAUTIFULLY FINISHED. ALL PARTS SHIPPED IN THE UNITED STATES ARE INSURED YOU ONLY PAY SHIPPING FOR THE 1ST PART PURCHASED AND ALL OTHER PARTS HAVE FREE SHIPPING AND YOU CAN EVEN MIX OR MATCH PARTS LIKE TIRES, WHEELS, GEARS AND MORE ................ WILL SHIP WORLDWIDE-WITH A MULTI ITEM SHIPPING DISCOUNT. FREE SHIPPING FOR PARTS WHEN THEY SHIP WITH A LARGER ITEM SUCH AS A CAR OR SET.