Features: - Special heat treatment gives it a blue color and a unique flexibility. - Reciprocating motion, the rotation direction changes continuously during the treatment period, the stress is widely distributed, not easy to break and avoid being screwed in. - With the variable pitch, deep groove of blade thread, make the file a better debris removal efficiency and less prone to screw in. - Triangle cross section: The smaller core make it has a better flexibility and can comply with the curvature of root canal well, compared with the file with larger core, like square cross section. Specifications: - Length: 25 mm. - Material: NiTi. Pack contains: - 1 x #20-06. - 1 x #25-06. - 1 x #40-06.