"2.5D" is a term coined by cardstock modelers to identify models that are made up of two-dimensional parts, arranged to give the illusion of a three-dimensional object. They have the advantage of being simple to construct, while still being visually attractive.
Ideal for age-of-sail gamers with limited space, or those who feel they don't have the patience for 3D models, these little gems gives you the look of grand fleets of sailing ships for a minimum of effort and cost.
$10.00 USD gets you a dozen files, allowing you to quickly and easily build fleets of 1:2000 scale sailing ships, representing the naval forces of the great powers of Europe during the Napoleonic Wars.