Luminous Responsive Yoyo, yoyo balls glow K1-Plus come with regular flating bearingmade 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 before, and have more fun without weighting rings. A perfect toy for kids, friends, families, etc; Recommended for Kids Daily Practicing or Competition.If There is A String Get Stuck: 1.Remove the string firstly 2.Take a look at whether the ball is loose and the two hemispheres must be tightened well 3. Attach the string properly.(The most important thing)Applicable moves: (1A, 3A, 5A)Weight: 65gDiameter: 51.03mmBall width: 41.01mmShaft width: 4.38mmBearing: 8-ball U-shaped shaftScrew: M4*16mmColour:blue / greenMaterial:ABSPackage Contents:1 * ball1 * gloves1 * velvet bag5 * rope (random color, specified color not accepted)Only the above package content, other products are not included.Note: Light shooting 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.