Aluminum alloy material, light and flexible, shock-resistant and more stable The two spheres are consistent, reducing data tolerance, thus ensuring the stability of the sphere during rotation, prolonging the , and suitable for 1A/3A/5A moves. The ball arm gradually forms a Vinclination near the central axis, which reduces friction and makes the ball idle . The 10-ball U-shaped shaft adopts high-precision bearings to reduce the functional wear and tear of the yo-yo, and realize more fancy and action. Adopt secondary oxidation technology, exquisite process design, superior performance, matching PC top finger cover is a spherical shape specially challenging the top finger. size: Diameter 57mm Material: alloy colour: black Note: Random color, 't accept the specified color. Package Contents: 1 x Ball 3 x Rope (random color) 1 x Glove 2 x recycling stickers 1 x Bearing (random color) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.