File with constant external taper and a core with variable taper and larger spaces for debris removal. Innovative reciprocating file with a variable taper core. Rapid and efficient substance reduction thanks to the large spaces for debris evacuation. Properties that are nearly identical or superior compared to files subjected to heat treatment - high safety for the patient and optimal preparation for curved canals. (Highly resistant to cyclic fatigue and flexible). Ability to adapt to any canal anatomy - Wide range of Procodile instruments compared to competitors. Green coating for easy identification.