Caliburn Matrix I Darts – Soft Tip – 90% – C1 – Black – 18g. This Caliburn Matrix I Soft Tip Dart features a 90% straight 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 – Soft Tip – 90% – C1 – Black – 20g. This Caliburn Matrix I Soft Tip Dart features a 90% straight 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.