Caliburn Starships Darts – Steel Tip – 95% Tungsten – Waterdrop – 21g. Each pack contains 95% tungsten barrels, stems and flights. Thread: 2baCaliburn Starships Darts – Steel Tip – 95% Tungsten – Waterdrop – 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.