4x4x8 IIA bandaged 8x8x8 with 3D printed extensions.
4x4x9A half regular cuboid from Grégoire Pfennigs series of cuboids of 2012.
4x5x5The "biggest" cuboid in the range of N<=5.
4x5x5 CamouflageThis 5x5x5 has resin dice glued on multiple sides to make it look like a 4x5x5.
4x5x6The (fully functional) logical next step after 1x2x3, 2x3x4 and 3x4x5
4x5x7A fully functional cuboid made by customly reducing a 7x7x7.
4x6x6A fully functional cuboid with half-regular dimensions.
4x6x73D-printed extensions glued onto a 8x8x8.
4x6x8Also known as "Another Ultimate Shape Shifter". Another entry in the ever growing field of fully functional cuboids.
4x6x8 bump cuboidA 4x6x8 bump cuboid (mirror blocks) made with 3D printed extensions.
4x7x7A true 4x7x7 custom made from a 7x7x7