- Maillefer Protaper Retreat Assortment - Designed to be used in sequence to remove filling materials - Three easily identified files are designed for the different needs of unfilling the canal before reshaping - The D1 file has a working tip that facilitates initial penetration - Each handle is no more than 11 mm for better visibility. Size:D1,D2,D3 - Use for removing gutta percha and fillings in root canal, Recommended speed is 150-300r/min,torque 2.5N.cm, **For further product information, please contact Chat Support**