Caliburn Mermaid Darts – Soft Tip – 90% – Natural – 18g. This Caliburn Mermaid Soft Tip Dart features a 90% straight tungsten barrel with a scalloped section at the rear. 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 Darts – Soft Tip – 90% – Natural – 20g. This Caliburn Mermaid Soft Tip Dart features a 90% straight tungsten barrel with a scalloped section at the rear. 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.