Features: - DLC Surface: Diamond-like carbon film (DLC) is an amorphous film with high hardness and elastic modulus, low friction coefficient, wear resistance, and good vacuum tribological properties, and this film perfectly enhances the resistance to cyclic fatigue of Rainbow one file while ensuring cutting efficiency. - Flexible: Super NiTi materials, with special heat treatment, make the file keep high flexibility. - S Cross Section: The S-shaped cross section enhances the cutting efficiency. - Variable Pitch: From the tip of the file to the shank, the pitch becomes bigger, and variable pitch releases more room for debris capacity, making it easier to remove debris from the root canal. - Greater resistance to cyclic fatigue: Upgraded polishing technology significantly improves the file's resistance to cyclic fatigue and through fine surface treatment, this technology can effectively reduce surface defects, thereby reducing stress concentration and delaying the formation and expansion of cracks. Specifications: - Size: #25. - Taper: 04. - Length: 25 mm.