No blocking with dentine chips, No blocking of instruments, High flexibility, A shaft length of 11 mm facilitates easier access to molars. Reliable mechanical glide path for initial preparation with instrument sizes 10/.04 and 15/.05. M two instruments have an s-shaped cross-section and two efficient cutting edges. In addition, M two is designed with minimum radial contact as well as large and deep flutes for continuous upwards evacuation of dentine chips. The instrument core is designed for maximum flexibility, however, without compromising the instrument strength.