1. [Product name]: Yuxin Zhisheng Black Kirin Skewb magic cube, with the new internal structure perfect for both cube beginners and professionals. 2. [Well made]: Cube size: 56x56x56mm. Cube weight: About 72g. Package weight about 82g. Made of eco-friendly, ABS environmental plastic material, no-toxic and harmless to human and environment. 3. [Anti-POP wing design]: The cube uses Anti-POP large wing design, which can effectively prevent flying edges and enhance the stability of Cube. 4. [Double inner anti-stick design] There are 2 inner circle anti-stick grooves inside the cube, which can effectively prevent the cube from sticking and not easy to rotate. 5. [Screw Center Shaft Design] The central axis of the cube has a reinforced rib design to make the screws more stable. The vertical 2mm screws are not only small and sturdy.