Connect kite with the swivel clip, stop the going line with the lock, young kids could handle it by themselves. Waxed twisted thread, 60lb x 600ft, you could fly larger kites higher in the sky.The Ring Line-Guide and the thicker cord(Diameter: 1.2mm) make the spool not easy to get tangled. Smooth Rotation with lower noise. High quality 6 captive steel roller bearings makes the kite string holder spinning smoothly and easily, made of premium materials, lasts for years.