NiTi rotary file with special heat treatment for high torsional strength. Establishes a smooth and reproducible glide path after root-canal negotiation. Maximum flute diameter in 1mm reduces dentin removal in the coronal part (compared to same-size progressive taper). Variable pitch and helical angle reduce debris accumulation on flute. Reduces "screw-in" effect. Triangular cross session for better cutting efficiency. Presterilized file is ready to use, does not need sterilization, and is single use for more convenience. Files are available in 17mm, 21mm, 25mm, and 31mm lengths; tips are available in 0.13 and 0.18; and taper is 0.06.