Steel-tip for tungsten darts, you have two options, fixed-point or moveable-point.

Fixed-point Steel Tip Tungsten Darts
The point is solidly fixed into the dart, it does not move. This is the most common type of dart you will see.

Moveable-point Steel Tip Tungsten Darts
Guess what, these point's move! There are a number of different varieties on the market, but the theme behind them all is the same, "Help decrease the chance for a bounce-out". When you throw the dart, you want the point to be fully extended. The hope is that if you hit a wire, the back-end (or barrel) will then move forward and force the point into the boards as opposed to letting the dart bounce off the wire and fall to the floor. If you are always throwing on real hard boards, or older type boards that don't have all the nice features, moveable points may be for you.