- TF™ Twisted Files 30/.06 23MM, PK/3. - TF™ (Twisted File) is the first and only file to employ unique and proprietary production technology that achieves unrivalled strength combined with flexibility. - R-Phase™ thermal treatment technology optimizes the properties of NiTi files to give 70 % more flexibility and 2-3 times more resistance to cyclic fatigue than any other rotating file. - Being drilled rather than ground optimizes the surface structure of NiTi, thus avoiding the accumulation of micro fractures. - This process makes the file stronger; other endodontic files have cutting angles that are incorporated through grinding or milling, which damages the integrity of the metal and can lead to file breakage. - The advanced surface conditioning of the TF completes the surface treatment while respecting the integrity of the underlying grain structure. - Tests have demonstrated greater strength of the files. **For further product information , please contact Chat Support**