The middle button,You can press to open the treasure ball.Use the thicker and harder material,It's more robust.The spring design using plastic wrap to Improve conventional skewed closed lax problems.And as the plastic wrap.It can prevent the spring and pointed scratching the skin.Ball Size:7 cm. Kids Love Them.A Perfect Toy Gift for Your Kidsสนใจ ทัก inbox ได้ครับwww.facebook.com/actioncamerashopsid กดเพื่อดู Line: xxxxxMB: กดเพื่อดูเบอร์โทร xxxxxx143อ่านเพิ่มเติม