Target 21g, 90% Tungsten Precision Silica Gemini Steel Tip darts, complete with Pro Grip shafts and Target Vision flight. This model is coated in Titanium Silicon Nitride - at 3600 Vickers Hardness Value, it is the hardest coating we have ever produced. As you play with Silica darts, you will notice that the coating enhances the synergy between finger and barrel, increasing the authority of your grip, and the confidence of your throw. Comes with Target"s unique lifetime barrel guarantee.