Length：21mm/25mm Material：NiTi Speed：250-360rpm Torque：2.0-3.0N.cm 1.This file utilizes a unique approach in wire processing that increases cyclic fatigue resistance and improves torque strength 2.Follows the natural curvature of the tooth Q:Which system is advantageous in curved canals? A:Kindly choose our files ! Package: 6pcs 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, you can bid on this item only if 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. Seller name:Dentalbravo City State: SHENZHEN,China Telephone number:0755-69985450