Parallel shape with grooves: great retention, Metal filament: allows radiographic visualization, Longitudinal fibers: easy removal, For use with Peeso (Largo) drills: easy to adapt, High concentration of fibers: great mechanical properties, Modulus of elasticity similar to dentin?s: lower risk of root fracture, Conical tip: less tissue removal in apical third of root canal, Direct use (prefabricated): saves clinical time and decreases lab costs