The Combo offer is a great money saver. If you are an avid cuber or even if not you would definetly want more than one cube. Why purchase seperately and pay more. For all aged - 3x3x3 Silver Mirror Cube is a shape mod that creates different shapes from ordinary 3x3 cubes. It is an extra challenging because as when it is scrambled it . Excellent stability - It doesn't corner twist as often nor does it lock up. Difficult to pop, good control of the cube. Definitely a good choice for you to improve personal record in competitions. This cube can be used for international competitions. If you want to break the records, get yourself one ! Modification in to 4x4 from 3x3 icreases the level of complexity and add more fun in to it Great corner cutting,Tension adjustable. Smooth turning and excellent rotation.Makes excellent educational toy Completely stickerless. Colours may vary. It Has Powerful Forward & Reverse Mechanism with high end stability. The Cubes has Been Through Top International Cubers. Make You Personal Best Record With Itchanges shape. Turn and twist the sides of the cube so that you return it back to its original cube-like shape. Try a bigger challenge! Enjoy hours of fun with you family and friends.