Files specially designed for retreatment proceduresContinuous multi-taper design， each file has its own specific work area， makes canal shaping easier， safer， faster and more efficient;Convex triangular cross-section， providing high cutting efficiency;Improved design of the tip is gentle so that to avoid damage to the root canal wall;Design of the pluralism and spiral groove angle to minimize embedding into the root canal wall in the rotation process;Specifications:Materials: NiTi Length: 34mmSpecific models of the tips: SX， S1， S2， F1， F2， F3for Machine usePackage included:6 x NiTi Dental Dentsply