Luminous Responsive Yoyo, yoyo balls glow K1-Plus come with regular flating made by ABS, Style String Trick (1A, 3A, 5A), Durable and has high performanceKeep The Noctilucent yoyo under the light or in the sunlight for a few minutes to charge the glow effectHeavier than , and have more without weighting rings. A perfect toy for kids, , families, etc; Recommended for Kids Daily Practicing or Competition.If There is A String Stuck: 1.Remove 2.Take a look at whether the ball is loose and the two hemispheres must be tightened 3. Attach properly.(The most important thing)Applicable moves: (1A, 3A, 5A)Weight: 65gDiameter: 51.03mmBall width: 41.01mmShaft width: 4.38mm: 8-ball U- shaftScrew: *16mmColour:blueMaterial:ABSPackage Contents:1 * ball1 * gloves1 * velvet bag5 * rope (random color, specified color not accepted)Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.