The Original Hammer Head No Bounce Dart line was designed and patented by Walt Bottelsen. The Hammer Head mechanism virtually eliminates bounce outs. These 90% tungsten darts feature the revolutionary Shark Skins sandpaper grip. This grip helps ensure a consistent throw every time. 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).