The YJ Zhilong 4x4x4 is a 4×4 speedcube that is only 56mm (the size of most 3x3x3s), it has strong magnets on the inner layers and lighter magnets on the outer layers, allowing for faster solving at the 3x3x3 stage, it has a design similar to the ever popular YJ MGC 4x4x4 as it is designed by the same manufacturer.
This version features corner-core magnets as well as the regular corner-edge magnets.