The revolutionary Edge Files X7 uses our own flexible FireWire NiTi forged with our proprietary heat-treating process. The FireWire NiTi alloy improves strength and flexibility. Specifications: - Parabolic cross section. - Highly flexible. - High strength. - Speed: 300-500 rpm ( clockwise rotation). - Torque: 250-400 N.cm. - Size: #17. - Taper: 4%. - Length: 25 mm.