This innovative TERO AK4 flights are new patent system from CUESOUL, well-designed built-in spring telescopic and rotation combo system (combine with AK7 dart stem), perfect for soft tip and steel tip darts. Rotation (without wobbling) allows each dart to be closer together, avoids flights ripped out caused by hitting previous dart, telescopic prevent dart's deflection when hit the previous dart, both assure the flights more durable use. This TERO system help your darts fly more stable and truer, it will keep you away from trouble of always pick up the flights come off in the dart game. Reinforcing rib molded on upper and bottom of each flight sheet to well protect flights from torn in shooting. Precision molded assures the flights retain 90 degrees for perfect angles in each shot, make flights well fit the AK7 shafts to be without wobbling when flights rotating. Total 9 colors available, with modern and attractive pattern design on flights, you could also mix-match casual with your personal style. Size: Could combine with different size TERO AK7 dart stems to set up 8 sizes length flights， Display in crystal gift box.