- M3-Pro gold is a series of multiple sequence files that applied with the most advanced metallurgy technology. - The gold heat treatment enhances the flexibility and resistance to cyclic fatigue. - Its convex triangular cross-section increase the cutting efficiency and preserve the detin as well. - Material adjustment: Enhance the rigidity and sharpness of the file, increase the lifespan. - Length: 25 mm. **For further product information , please contact Chat Support**