Viper Steel Wire Dart Shaft Ultra strong steel construction provides incredible strength for its weight for a revolutionary difference in flight-barrel balance Provides a unique front-loaded weight balance for all new ways to optimize your flight path The locking hole allows you to use extra leverage to tighten shafts to your barrel. They wont come loose easily, and theres no need to retighten after a shot or two Choose between short or medium size for proper spacing between barrel and flight is critical for perfect aerodynamic trajectory This package includes 3 shafts for your whole dart set