AF™ Wire is a special Heat-Treated technology for producing Endodontic Rotary files. 

AF™ Wire is a NiTi alloy, which has excellent mechanical strengthflexibility, and good cutting efficacy. There are 3 levels of flexibility (depending on their crystallographic phases present in the alloy): 

AF™ - H - Extremely Flexible

AF™ - R - More Flexible

AF™ - L - Flexible