Dart Zone® Pro Performance Darts are designed with increased stability for better, straighter flight. Pro Series Darts are compatible with the Pro MK-1, MK-1.1, MK-2 and All Pro blasters designed by Dart Zone®. Set Includes 240 Total Pro Darts – 120 Standard Length Pro Darts and 120 Half-Length Pro Darts. Pro Performance Darts fly up to 150 feet. Recommended for ages 14+.