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 performance Keep The Noctilucent yoyo under the light or in the sunlight for a few minutes to charge the glow effect Heavier 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 important thing) Applicable moves: (1A, 3A, 5A) Weight: 65g Diameter: 51.03mm Ball width: 41.01mm Shaft width: 4.38mm : 8-ball U- shaft Screw: *16mm Colour:blue Material:ABS Package Contents: 1 * ball 1 * gloves 1 * velvet bag 5 * 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.