Hex terrainpiece 33mm (side to side) and 20mm high. Takes 6 magnets sized 10mmx1mm for magnetic connections. Place magnets with North in the same direction (making 3 sides north and three sides south) or alternate north and south on all faces, but important be consequent for each and every hex or this will not work!
The hexes are also stackable to make higher terrain tiles.
UPDATE 2023-07-20:
(The green version in the photo is a previous model using 5mm x 1mm magnets, but they proved a bit to weak to keep the hexes together).
The author marked this model as their own original creation.