4×4 Qiyuan S 4x4x4 Speed Cube Stickerless Puzzle Cube(Qiyuan Version)

My 10 year old recently became very interested in Rubik’s Cubes. After he solved the typical one in a few hours using YouTube videos and their algorithms, he upgraded to this one.He calls it a speed cube, but I’m not sure if that’s a trademarked name or a generic term. He says it’s incredibly smooth when moving, makes no noise, and is great for gaming. He’s used the enclosed “cheat sheet” algorithm but he’s still been working on it a few days and doesn’t have it down to a fine science yet.Good product, good price. Recommend.