The YJ ZhiLong 4x4 has been out for a few years and has been quite popular, it has been used by quite a few younger cubers and those with smaller hands as it performs well but is just a bit smaller than normal, it is just 56mm, compared to the MGC and Vin Cube at 60mm and the AoSu V7 st 58mm. Adding core magnets on big cubes seems to be getting more and more common but it just doesn't work quite as well on 4x4s. The cube performs just as well but the core magnets are quite strong and the cube is just a bit too small for me.

Buy it here