The Luke Humphries 90% from RED DRAGON is a dart set with barrels of 90% Tungsten and is the ultimate dart set from the famous darts player Luke Humphries, who has already won many victories. Luke Humphries 90% arrows come standard with: Red Dragon Nitrotech shafts and Red Dragon flights. This personalized dart set comes in 2 weights; 21-23 grams. 21G = Barrel Length: 43.20mm, Barrel Width 7.20mm. 23G = Barrel Length: 43.20mm, Barrel Width 7.30mm.