Luminous Responsive Yoyo, K1-Plus yoyo balls with standard flat bearing. Made from durable, high-performance ABS material. Suitable for string tricks (1A, 3A, 5A). Charge the glow effect by exposing the yoyo to light or sunlight for a few minutes. Heavier than standard yoyos, offering improved weight distribution. A perfect toy for kids, friends, and family; recommended for daily practice or competition. If the string gets stuck: 1. Remove the string. 2. Check if the ball is loose; ensure both hemispheres are tightly fastened. 3. Reattach the string securely (most important). Suitable Tricks: (1A, 3A, 5A) Weight: 65g Diameter: 51.03 mm Ball Width: 41.01 mm Axle Width: 4.38 mm Bearing: 8-ball U-shaped axle Screw: *16mm Color: Blue Material: ABS Package Contents: 1 * Yoyo 1 * Gloves 1 * Velvet Pouch 5 * Strings (random colors, specific colors not guaranteed) Note: Only the above package content is included; other products are not included. Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.