The non-cuboid markers (fire, water splash, eye for detected units) are typically confined in 1cm×1cm×1cm cubes.
Useful for some tabletop wargame such as Harpoon V, the makers of altitude are 2cm×2cm clear resin cubes of different heights of 2cm, 4cm and 6cm.
Each marker set has 6 painted markers (except for the height markers which are unpainted) of the same style.