This is a set of the main gear and pinion for the REVO Elite IB Rocket 9. The gear ratio is 9.0. For right-hand handle. I ordered this for modification, but it was not compatible, so I have been storing it. It has been opened, but it is unused. Although it is unused, it has been in someone's possession, so please understand this before purchasing. No returns, refunds, or exchanges. Please understand that we cannot provide compensation for accidents caused by the shipping company. Please complete the purchase process within 24 hours. Receipts will not be issued. Please provide a receipt evaluation promptly after receiving the item.