Winmau put some of their most interesting engineering into barrels rather than boards. Valhalla is machined from a fused billet combining 95% and 85% tungsten, so the density changes along the barrel and the balance is tuned internally rather than by shaping the outside.

The signature ranges have real character. Michael van Gerwen's barrels run long and slim at 53mm, several offering half-gram weights like 21.5g that only exist because a player asked for them. Simon Whitlock's sit at the opposite end, noticeably broader at 7mm and above.

Callisto, Kairos and Blackout each run several profiles under one finish, and a few hold identical dimensions across every weight — so moving up a gram changes the mass and nothing else.