Mor-Flex® files are “K” type files with a cutting tip design. The files allow for comprehensive cleaning and shaping of the canal. The flat end of the handle may be accurately used as a radiographic landmark on X-rays. Mor-Flex® files are made from the purest stainless steel which helps ensure the material strength of the file. Large helix angle. Shape of cross-section up to size 40 is square, size 45 and larger is triangular.