Check the listing for details. CNC Flywheel Starter Marine Boat Engine GP18 GP21 GO21-GO25 Methanol Engine. Color: Silver, Condition: New. Listed at 12.34 USD. Description: CNC Flywheel Starter Marine Boat Engine GP18 methanol engine rc boat #453 material: aluminum flywheel Suitable for GP18 methanol engine Inside diameter = 5 mm Height = 16 mm Outside diameter = 28 mm CNC Flywheel Starter Marine Boat Engine GP21 methanol engine rc boat #454 material: aluminum flywheel Suitable for GP21 methanol engine Inside diameter = 6.35 mm Height = 12 mm Outside diameter = 26 mm Payment Policy : We only accept payments via PayPal. Shipping Time & Method: Item will be shipped within 3 days after payment is confirmed. Goods will be sent via airmail . Delivery takes about 18-25 business day (without holidays). All products have been checked and packaged in good condition before dispatch. Please make sure your address in PayPal is matched with your shipping address before pay. If you would like to change the address, please contact us IMMEDIATELY after your payment. Return policy :After receiving item.,items can be returned within 30 days . Items must be the original packaging. No use. No damage. Buyers bear the freight cost. CNC Flywheel Starter Marine Boat Engine GO21 -GO25 methanol engine rc boat #1362 material: aluminum flywheel Suitable for GO21 -GO25 methanol engine Inside diameter = 17 mm Height = 14.3 mm Outside diameter =31 mm