[Responsive Yoyo for Beginners] K2 PLUS is one of the top recommended functional entry-level yo-yos. It is a kids' yoyo, ideal for beginners to practice basic string tricks such as 1A, 3A, and 5A. With just a gentle tug, it returns to your hand easily. [Dual Purpose Yoyo - Also Pro Unresponsive Yoyo] The K2 yo-yo is responsive out of the box. The package includes an unresponsive conversion kit. When you advance to the next level, simply change the response system using the included parts to convert it into an unresponsive yoyo. No need to purchase another yo-yo, offering great value. [Made of High-Quality Materials] Constructed from high-quality PC material, this yoyo features a beautiful crystal color, is wear-resistant, pollution-free, and safe for children. Durable and sturdy design makes it a perfect gift for kids, beginners, and enthusiasts, ideal for Christmas or birthday gifts. [Important Information] 1. For responsive yoyo mode, if the yoyo does not return sensitively, it is advised to apply a small amount of lubricating oil or rust-proof oil to the axle (apply both inside and outside of the bearing). 2. After converting to unresponsive mode, the yoyo will not return to your hand when pulled. You will need to learn a trick called a "bind" to bring the yoyo back. Body Shape: Butterfly Diameter: 55.33 mm Width: 42.67 mm Gap Width: 4 mm Bearing Type: Center Trac Axle: 3mm x 8mm Surface: Shining Finish Style: String Trick (1A, 3A, 5A) Response System: Silicon Pad (random color; specific color cannot be specified) String Length: 43.31 in / 110 cm Material: PC Color: Blue Package Contents: 1 x Yo-yo 1 x Puller 5 x Replacement Strings (random colors; specific color cannot be specified) 1 x Storage Bag 1 x 10mm Screw 1 x 8-Ball Bearing Note: Light and display differences may cause the item color to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.