Patented alternating flat surface. More Debris removal upwards and no pushing of debris apically. No Screw-in effect. Great compromise between cutting efficiency and flexibility, due to the modified S-shaped cross-section. Flexibility of the file is more due to the alternating flat surface design, where there is less metal core of the file. Better negotiation of the root canal with great respect to the canal anatomy due to the unique design features. The file shows a very smooth sensation during cutting and root canal preparation, thanks to the alternating flat surface design aided by the asymmetrical cross-section. - Certification: Class IIa, CE, ISO. - Size: #35. - Taper: 4%. - Length: 25 mm.