This is a fully functional 3x3x7 made of high quality plastic. The Cube4You 3x3x7 is not only very interesting and fun to solve, but its swishy sound and turning feel adds to the experience of playing with this unique puzzle. Its shape and layers keeps it as portable as a 3x3 but allows it to pack a more interesting time. This puzzle is ideal if you are someone who appreciates a bit of a novel puzzle but don't want to stray too far from the 3x3.