Caliburn Nexus Darts – Steel Tip – 95% Tungsten – N2 – 21g. Each pack contains 95% tungsten barrels fitted with Caliburn replaceable points, stems and flights. Thread: 2ba Supplied fitted with the Caliburn Replaceable Point System.Caliburn Nexus Darts – Steel Tip – 95% Tungsten – N2 – 23g. Each pack contains 95% tungsten barrels fitted with Caliburn replaceable points, stems and flights. Thread: 2ba