Caliburn Mermaid II Darts – Soft Tip – 90% – Natural – 18g. This Caliburn Mermaid II Soft Tip Dart features a 90% torpedo shaped tungsten barrel. The enhanced ring grip runs along the full length of the dart. The natural look enhances the visual appeal of the dart. They come complete with Caliburn Dart Shafts and Flights.Caliburn Mermaid II Darts – Soft Tip – 90% – Natural – 20g. This Caliburn Mermaid II Soft Tip Dart features a 90% torpedo shaped tungsten barrel. The enhanced ring grip runs along the full length of the dart. The natural look enhances the visual appeal of the dart. They come complete with Caliburn Dart Shafts and Flights.