The QY 3x3 Mirror Cube is a shape mod that Compared to the traditional 3x3 cube Mirror Cube, it is more difficult. It is an extra challenging because as it is scrambled it changes shape, which will test our spatial thinking ability even more Made of environmentally friendly ABS material, silver stickers, PVC Stickers, which is lightweight, durable, harmless to human and environment. It is a shape mod in which the pieces shape shift making it look like a mess, but once you solve it, it magically becomes cube shaped again. It doesn't corner twist as often nor does it lock up. Improved anti-pop technology and structure, good control of the cube. Definitely a good choice for you to improve personal record in competitions.