V-Cube 7 (7x7x7)
The V-Cubes are based on patents secured by Greek inventor, Panagiotis Verdes. The patents cover mechanisms for cubes ranging from 2x2x2 to 11x11x11 although products have only been released in the 5 - 7 range.
The V-Cube 7 was the first mass-produced cube with these dimensions. It is pillowed at the edges so that the pieces don't fall off when you turn the faces and you can see in the image that the edges are sized differently. None of this makes any difference to the solution.
This is a very expensive puzzle to buy - around £40 and not really any cheaper in the second-hand market. There are some knock-off cubes out there too - be careful. This puzzle is beautfiully made but a little more fragile than the smaller V-Cubes and, with smaller pieces, liable to pop on you if you aren't careful. It's also fairly large - if you are as slow as I am with the larger cubes, your hands will be hurting a little by the time you finish solving it.