The Original Hammer Head No Bounce Dart line was designed and patented by Walt Bottelsen. The Hammer Head mechanism virtually eliminates bounce outs. These barrels are machined from a 90% tungsten billet to the exacting aerospace specifications. The knurling is finely cut razor edges for an-out-of-this-world grip. Darts come complete with 2ba shafts, flights, Hammer Head moveable steel tips <i>(Points are moveable point-Hammerhead mechanism)</i>, Hammer Head dart wrench, and dart case (Case may vary with stock availability).