HyFlex Controlled Memory NiTi Files are extremely flexible and have controlled memory. They follow the anatomy of the canal closely, reducing the risk of ledging, transportation or perforation. The files can be pre-bent. The files respond to excessive resistance with straightening of the spirals, which avoids binding to the walls. This form adaptation can be reversed by heat treatment (during autoclaving or with a glass bead sterilizer) returning the instruments back to their original shape. The heat treatment makes them more resistant to cyclical fatigue and provides a clear visual opportunity to verify safe continuation of file use. Sequence contains 6 different files. 1pc file size 25, taper 8%, length 19mm, 1pc each of files sizes 20-40, taper 4%, length 31mm and 1pc file size 20, taper 6%, length 31mm.