The Phase 4 Purist Barrel by PDC World Champion 2015 and 2016 Gary Anderson features a maximum weight tolerance of ±0.1 g. The barrels are made of 90% tungsten and are adorned with the Unicorn logo and Gary Anderson's signature. Delivery includes barrels only in a Purist Wallet. These barrels are available in weights of 21 g, 23 g, 25 g, and 27 g.