<prompt> Alternate contact points along shaft are seen inK3RACEReal World EndoLight speed  <response>: The blank design employed by the Endo Sequence file is a triangle with alternating contact points ACP along the instruments ,hunk. The Endo Sequence file undergoes electropolishing and the result is visible in its mirror-like finish that remains sharper longer and mays cleaner during use.About RACE:Design of the reamer with alternating cutting edges RACE: twisted areas alternate with straight parts. The NM surface is treated chemically resulting in an obviously smoother surface than other instruments.About 3:Positive rake angleVariable helical flute anglePeripheral blade reliefThird radial landVariable core diameterSafe-ended tipWide radial landsAbout Lightspeed:The LightSpeed root canal instrument has a noncutting tip and a short blade. The shaft is smooth, nontapered and very flexible. Instruments have physical resemblance with Gates Glidden drills. Also remember that term 12 peck e is associated with lightspeed instruments. 