MAGIKON Snake Cube Wooden Brain Teaser Puzzle Toy, 60mm The corners of all the cubes are rounded and that makes for very smooth operation The cubes come in 3 colors, the wood is beautiful and it is well finished and has an excellent finish There is no difficulty in taking it apart (actually stretching the cube into a snake) but will take patience to put it back into cube shape again Even after you know how to do it: The challenge remains to compete with oneself or others to see who can "do it' the fastest" MAGIKON is a registered trademark(serial number: 86934971)