This is the speed cube Mats Valk used to break the world record for solving a Rubik's Cube in November 2016 with a time of 4.74 seconds. It is arguably the best speed cube available today.
Mats has even helped design the cube himself with speed-cube experts QiYi. It has a faster turning action and looser mechanism than a standard Rubik's cube, for use in speed-cubing competitions. And you can adjust the tension to match you personal preferences. Of course.
The Valk 3 is available in black, white and stickerless variants.
Price = p251 pence = £15.97