• RESPONSIVE YOYO: yoyo K2 crystal fits 2 different yoyo ball bearing. What you have received is a flat slim bearing responsive yo yo. It will automatically return to your hand when pulled. Slim bearing is great for kids beginner to learn basic yoyo tricks
• UNRESPONSIVE YOYO: replace it with a U type bearing by yoyo removal tool, and it will becomes an unresponsive yo-yo. You will need to learn a trick called a "bind" to bring the yoyo back. Suitable for medium and advanced players
• DURABLE MATERIAL: the K2 plastic yoyo is made of PC with the beautiful Blue and yellow gradient crystal color, it’s wear-resisting. Yoyo k2 crystal yo-yo is safe for kids to use. Durable and sturdy, not easy to be damaged
• GIFT FOR KIDS: professional yo-yo can enhance physical coordination, intelligence and intelligent response capabilities, increase their self-confidence and keep children away from computer games and mobile phones. Yoyos is great Birthday, Thanksgiving, Christmas gift for your families boys / girls / adults or friends etc
• PACKAGE LIST: 1 x good yoyo K2 yoyo (Responsive Yoyo), 12 x Yo yo String Replacement (Random Color), 1 x Yo-yo Bag, 1 x Professional Bearing Removal Tool, 1 x U Type Bearing (Unresponsive Bearing), 1 x M4*10mm Axle. Tips: If the yo yo do not come back sensitively, it is advised to add few lubricating oil or rust-proof oil into the bearing(add the oil inside and outside of the bearing)