Winmau Mervyn King darts 90% 26 grams or less. .What. This is Winmau. Modelled by Mervyn King. The material is 90% tungsten. Barrel weight: 26 grams. Total weight: 27.5 grams approx. Barrel length: 50.8mm. Barrel diameter is 6.35- 7.4mm. Type of tip: metal. Rope thread: 2 to 4 mm. .What. The Winmau Mervyn King 26gr darts set consists of 1 set of 3 bodies with metal tip, 1 set of 3 Vecta Short rods, 1 set of 3 Prism Alpha feathers and 1 metal tip guard.