Features: - Operation type: Engine use. - Materials: Made of high-quality NiTi. - Rectangular cross-section design. Advantages: - M-wire NITI material improve flexibility, while still retaining cutting efficiency. - The proprietary heat treatment process significantly improves fatigue resistance. - Off-centered rectangular cross-section, strong debris removal ability. - "S” shape rotating motion track makes it more efficient to pass through the curved part. - Protect more dentine. - The recommended rotary speed of engine files is 250~400RPM. Specifications: - Size: X3. - Length: 25 mm. - Color: Gold. **For further product information, please contact Chat Support**