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