The built-in t-connector no longer USES metallic materials, but instead USES a new type of lightweight plastic mainly made of special epoxy resin. The lightweight resin joint makes the frame more stable and powerful. High-tech frame design: The Isometric Square Head Shape have larger sweetspot, improved hit rate. It will also enhance the defense, increase the effective range. This unique pyramid frame rim design accords with air mechanics, minimize the resistance to swing, you can faster to hit badminton speed.