Check the listing for details. Dental Heat Activated Niti Endodontic Root Canal Files Machine Engine Use S1. Condition: New. Listed at 8.49 USD. Description: These tips are used for preparing Root Canal Treatment. 1. Engine Use 2. Length: 21/25mm 3.Model: S1/S2 4.With preciseprocessing technology, products in good flexibility, high quality cutting efficiency and fracture resistance. Package: 6 Pcs/Pack Note： Which one do you want to choose, please leave a message FDA Statement: The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. If the item is subject to FDA regulation, I will verify your status as an authorized purchaser of this item before shipping of the item. This item has been cleaned and treated according to the manufacturer's instructions