Unicorn Darts World Champion Ambassador Bob Anderson 90% Tungsten Soft Tip Set Unicorn World Champion Ambassador Range comes as part of the past and present world darts champions and are barrels that signature their world efforts, these were used by Bob Anderson and has Unicorn engraving as a hallmark of quality as well as Bob Anderson's signature.  Why tungsten for darts? The UniBoffin explains: Tungsten is Swedish for "heavy stone" and was well-named, being one of the densest substances known. The pure metal weighs around 19gms/cc, and although this reduces slightly when it is combined with small amounts of, eg, nickel to produce a more workable material, the resultant alloy. will still be 50% denser than lead and maybe twice as dense as brass or steel. Although tungsten is perhaps not the ultimate material for dart barrels (gold, which is of similar density, is too soft, but a case could be made for platinum / iridium at over 21gms/cc), it is certainly close and it has a distinct affordability advantage over the competition Product Features Natural Tungsten Guaranteed Weight Within 0.1g Icon case Engraved Unicorn Hallmark Material 90% Tungsten Weights Available 18 Grams (04074) Size Length: 42.55mm  Diameter: 6.30mm (18 Grams) Pack contains darts, flights, shafts and case. Model 04074