Exceeds all ISO/ADA specifications High Quality Stainless Steel Hand use with endo stops Blister card packing 6 pieces/blister in lengths of 21 , 25 , 28 & 31 mm Color coded, ISO colors & sizes Excellent cutting ability thanks to Cr-Ni Steel with high cutting ability, precision cutting edges and unique grinding technique Flatter cutting angles towards the tip ensure high resistance to fracture Special steel alloy with Uniform structure for maximum resistance to fracture & flexibility The inactive tip conducts the instrument safely along the canal Sterilizable up to 200 C /390 F