These are the heavy riders. They are much more heavily armoured than the light Orcs, with mostly scale armour and some mail, so they can probably provide the heavy punch in an Orc army.
Both boxes have the same set of two 6-Warg sprues for the rides. These are quite amazing for soft plastics, especially from this manufacturer. The details on the barding and fur are very crisp and will probably take dry-brushing well.
Previously, when there were no 1/72 fantasy cavalry, I bought some Eureka Miniatures 15 mm (more like 18 mm) Orc riders for cavalry. One of the Orc lancers is on the left compared to a Dark Alliance heavy Orc rider on the right. As you can see, the plastic Orc is the right size, but the metal Orc can fit well as a 1/72 scale goblin rider on a smaller wolf.
It'll be a while before I paint these up, as I have some other projects ahead of them, but it's getting exciting to be in 1/72 scale miniatures! Now if they'll only start making 1/72 sci-fi...