*Caliburn The Key Darts - Soft Tip - 90% - K2 - NaturalCaliburn The Key Darts Soft Tip 90% K2 Natural 19g. This Caliburn Key Soft Tip Dart features a 90% Tapered tungsten barrel, with a ringed design along the length of the barrel with a milled cut along the rings. This natural look and cut creates a perfect grip that works for many players. They come complete with Caliburn Dart Shafts and Flights. Caliburn The Key Darts Soft Tip 90% K2 Natural 20. 5g. This Caliburn Key Soft Tip Dart features a 90%