Sleep Yoyo 6061 Aluminum Alloy Yoyo Ball High Precision Bearing with Yoyo Strings 1A/3A/5A Trick Features: This amazing Yoyo can develop children's imagination, creativity, quick time, motor skills and hand-eye coordination. Made of aluminum alloy 6061 + environmental conservation plastic, light and flexible, shockproof and anti-drop, more stable. The two pieces of spheres are kept in line to reduce the data tolerance, thus ensuring the stability of the sphere during rotation and extending the sleeping time for 1A/3A/5A trick. The ball arm gradually forms a V tilt near the center axis to reduce friction and make the ball idle longer. Adopt high-precision bearings to reduce the functional wear and tear of the yo-yo and achieve more fancy styles and movements. Adopting secondary oxidation technology and exquisite craft design, it is a sphere specifically designed to challenge the top finger. Equipped with professional yo-yo rope, sturdy and durable. Specifications:  Color: multicolor Material: aluminum alloy + abs Diameter: 55.9mm Width: 42.3mm Shaft width: 4.59mm Bearing: High-precision 10-bead bearing Recycling sticker: yellow silicone Surface treatment: bright surface Screw specifications: m4 * 16mm Applicable trick: 1A,3A,5A Package size: 8.5 * 6 * 4.7cm Package weight: 100g Package List: 1 * Sleep Yoyo Ball (with String)