Glow-in-the-Dark Responsive Yoyo: The K1-Plus yoyo balls feature a standard flat bearing. Made from ABS, designed for String Tricks (1A, 3A, 5A), it's durable and high-performing. Charge the glow-in-the-dark yoyo by holding it under light or sunlight for a few minutes to activate the glow effect. Heavier than previous models and more fun without weights. A perfect toy for kids, friends, and family; recommended for daily practice or competitions. If a string gets stuck: 1. Remove the string first. 2. Check if the ball is loose and ensure the two hemispheres are tightened properly. 3. Secure the string correctly (most important). Applicable Tricks: (1A, 3A, 5A) Weight: 65g Diameter: 51.03mm Ball Width: 41.01mm Axle Width: 4.38mm Bearing: 8-ball U-shaped axle Screw: M4*16mm Color: Blue / Green Material: ABS Package Contents: 1 * Ball 1 * Gloves 1 * Velvet Bag 5 * Ropes (random color, specified color not accepted)