BRAND NEW-NEVER USED OR REMOVED FROM THE PACKAGE. THIS IS A 25 TOOTH OFFSET CROWN GEAR WITH SET SCREW INCLUDED FOR 3/32 AXLES USED FOR INLINE MOTOR CONFIGURATIONS USING THE SPECIAL DROP MOTOR POD WHICH ENABLES YOU TO LOWER THE MOTOR IN THE CHASSIS ENABLING YOU TO USE LARGER TIRES TO INCREASE YOUR TOP SPEED. HELD ONTO THE AXLE WITH A .095MM SET SCREW (USE SLOT-IT SIPA22 OR SIPA23 HEXAGONAL SCREWDRIVER TO TIGHTEN OR LOOSEN). IT IS MADE FROM A POLYMER WITH A METAL HUB MADE FROM BRONZE. THE GEAR TEETH ARE CUT AT A SPECIAL ANGLE TO ACCOMMODATE THE LOWER CENTER POSITION OF THE MOTOR PINION WITH A SELF CENTERING HUB AND IS MEANT TO BE USED ON ONLY SLOT IT CARS WITH THE DROP CENTER MOTOR POD WHICH IS USALLY GRAY IN COLOR AND ARE IN LINE MOTOR CONFIGURATIONS. IN CARS WITH CLOSE BODY TO CHASSIS MOUNTING LIKE A FORMULA 1, INDY CAR AND LMP IT IS BEST TO USE 23 OR 24 TOOTH CROWN GEAR. MOST SLOT IT CARS COME STANDARD WITH 28 TOOTH CROWN GEARS. IF YOU WISH TO PUT IN A LARGER GEAR IN THESE CARS YOU MIGHT HAVE TO FILE THE GEAR OPENING IN THE CHASSIS SLIGHTLY TO AVOID RUBBING WITH THE LARGER GEAR. IF YOU ARE REPLACING THE STANDARD PLASTIC GEAR IN MOST MANUFACTURERS CARS (USE THE REGULAR HIGH PERFORMANCE GEARS FROM SLOT IT - NOT THE OFFSET GEARS)THE STOCK AXLES ARE METRIC IN SIZE (SLIGHTLY LARGER DIAMETER) ALONG WITH THE BEARINGS, AND STOCK PLASTIC WHEELS. IT IS BEST TO REPLACE THE BEARINGS AND AXLE WITH SLOT-IT'S 3/32 AXLE, BEARINGS AND THE ALUMINUM SET SCREW WHEELS. YOU MAY STILL USE THE STOCK WHEELS THAT CAME WITH THE ORIGINAL CAR BY REAMING THEM OUT WITH A 3/32 DRILL BIT AND THEN GLUING THE WHEELS TO THE AXLE WITH SUPER GLUE. 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. ANY QUANTITY OF PARTS SHIPPED WORLDWIDE. WE ACCEPT PAYPAL, VISA, MASTERCARD, DISCOVER, AMEX ......................                                                                              MULTI ITEM SHIPPING DISCOUNT OF .00 PER EACH ADDITIONAL ITEM OF SIMILAR SIZE SHIPPED IN THE US.