Posterior XTS™ Composite Instrument Kit Posterior XTS™ Composite Instrument Kit TNPOSKIT Complete Posterior XTS™ Instrument set for composite procedures. Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.