Pro Ring with a 0.4g piece of tungsten in it. This allows you to add weight to the rear of the dart. It is perfect for those seeking to add weight to the back of your darts, if you feel your darts wobbling in the air, or if you just want to add weight to your darts in general. Steel tip players who see their darts land with the back high up might notice the biggest difference.
Only meant for use with L-style Pro flight system.