MAGICYOYO K1-Plus are great responsive yoyos for kids and beginners. Responsive yoyo means that when you tug the string of a sleeping yoyo, it will return to your hand and you don?t need to perform a "trick" called a "bind" to force the yoyo to return to your hand.MAGICYOYO k1 is Perfect and easily perform string yoyo tricks like the Trapeze, Split the Atom, Braintwister, or the Double or Nothing.If you like nonresponsive yoyoing and longer spin times, replace to your own wide Size C bearing and you're all set.TIPS:1. Please attach the yoyo string according to the instructions, DO NOT TAKE THE YOYO APART!2. If you are a beginner, you don?t know how to setup and use your first yoyo. Please put in the time practing and learning from watching videos, or contact us by email for help. We will do our best to provide you the best service.The Main Features of YoYo K1-Plus1. New, high-quality and popular plastic yoyo perfect for beginners and leaner. 2. Plastic yoyo K1 is not only for daily entertainment, but also for acrobatic performance with most entertaining fancy.3. Designed to train fine motor skills and eye-hand coordination.4. Responsive yoyo K1 can cultivate the imagination, creativity and rapid reaction ability. More Specifications:Parameters: Series K1Style String Trick (1A, 3A, 5A) For Age 8 years old upWeight: 65g Diameter: 51mm Width: 41mm Gap Width: 4.4mm String: 10 pcs 100% Poly yoyo strings for replacement.Package Included:2*K1 Yoyos? Dark Blue & Glow Green ?2*Gloves2*Bags4*Plastic Hubstacks10*Yoyo Strings ( random colors )Sleeping times?Responsive K1 sleep time is about 10 seconds, as responsive yoyo is easy to come back to your hands with a tug. If you need a longer spin times please replacement an unresponsive bearing, which will keep 3-5 minute sleeping time.