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 , , families, etc; Recommended 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: 65g Diameter: 51.03mm Ball width: 41.01mm Shaft width: 4.38mm : 8-ball U-shaped 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 products are not included. Note: Light 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.