<prompt> Protapers of same tip diameter areSx-S1S1-S2S2-F1Sx-S2  <response>: PROTAPER RUMERNTSA unique feature of Pro Taper instructions is each one has changing percentage tapers over the length of the cutting blades.Pro taper instruments have convex, triangular cross sections, a changing helical angle and push over their cutting blades and a non-cutting, modified guiding tip.The Pro Taper system is comprised of three Shaping and three Finishing instruments. 