The GAN 251 M Pro 2x2 is an update to the GAN 251.
The Pro features an adjustable magnet strength and the corner/core magnet system from the GAN 11 M Pro
Comes with GAN bag, GAN box, GES nuts, tuning rod and screwdriver.
Air: non-adjustable magnets
Pro (this puzzle): adjustable magnet system, the GAN 11 M's corner/core magnet system
Leap: adjustable magnet system, the GAN 11 M's corner/core magnet system, plus large angle magnetic alignment technology