The Peter Wright Mamba Rainbow 90% from RED DRAGON is a dart set with barrels of 90% Tungsten and is the ultimate dart set from the well-known darts player “SNAKEBITE” Peter Wright who has already won many victories. Peter Wright's Arrows. The arrows have a beautiful rainbow design over the barrel, making the arrow really in Peter Wright style. The arrow feels very nice in your fingers and ensures an optimal grip. This personalized dart set comes in 3 weights; 22-24 grams. 22G = Barrel Length: 54.40mm, Barrel Width 5.58mm. 24G = Barrel Length: 54.40mm, Barrel Width 6.20mm.