ProTaper Next rotary NiTi-file for crown-down technique. Files are made of patented M-Wire (proprietary thermomechanical processing procedure) NiTi alloy and have off-centered rectangular cross-section. Advantages: added flexibility and strength, significantly improved cyclic fatigue resistance, decreased risk of file separation, efficient removal of debris, improved file flexibility, and better respect of the original root anatomy. The files are packaged in pre-sterilised blister packs. Matching paper points, gutta percha points and GuttaCore obturators are available. Autoclavable but single use recommended.