Curette Barnhart 5-6 XP with a Posterior/ Narrow blade, deeper shank angle for posteriors. This Curette Barnhart 5-6 XP instrument is surface engineered with XP Technology. The XP curettes have a very fine and sharp smooth edge that is designed to more efficiently root plane. This is why one must take care not to abuse the edge on margins, overhangs, or by "breaking away" difficult calculus. Made in the USA.