I-xun Mf8 Teraminx Cube 7x7x7 Layers Megaminx Dodecahedron Puzzle, Sticker Finish Easy to turn - With lightning fast cornering and effortless gameplay, this puzzle is a joy Fun - Improved anti-pop technology and lightning cornering, different cube different experience Material - Made of eco-friendly ABS material, non-toxic and harmless to human and environment This cube is cleverly designed to have slightly rounded corners so as to facilitate the twisting.