From Games Workshop:

Deadwalker Zombies are created from the bodies of the recently dead, given strength through the power of dark necromancy and sent onto the battlefield in shambling hordes. Utterly mindless and driven by a collective instinct alone, zombie migrations have become an ever-present plague following the necroquake, and many cities have instituted roving 'pyre-gangs' to burn out an infestation before it grows too large.

Despite being slow, clumsy, and fragile on their own, a sufficiently large mob of Deadwalker Zombies can threaten even the most skilled enemy soldiers by weight of numbers alone. Their single-minded hunger even gives them a surprising turn of speed when prey strays too close, and anyone unlucky enough to be brought down by one may find themselves joining the Soulblight ranks before the battle is over.

The kit is comprised of 94 plastic components, with which you can assemble 20 Deadwalker Zombies. These models are supplied with 20x Citadel 25mm Round Bases.