Caliburn Matrix I Darts – Steel Tip – 90% – A1 – Black – 23g. This Caliburn Matrix I Steel Tip Dart features a 90% torpedo shaped tungsten barrel, with a quad cut grip along the dart. The black coating and remachine process enhances the visual appeal of the dart. They come complete with Caliburn Dart Shafts and Flights.Caliburn Matrix I Darts – Steel Tip – 90% – A1 – Black – 25g. This Caliburn Matrix I Steel Tip Dart features a 90% torpedo shaped tungsten barrel, with a quad cut grip along the dart. The black coating and remachine process enhances the visual appeal of the dart. They come complete with Caliburn Dart Shafts and Flights.