Pardulon Models have added a pack of five resin rat swarms to their online store.
From their website:
These rat swarms can be arranged in a variety of ways to form one large swarm, or attack a miniature. Depending on arrangement, these rats can cover an area of about 7×9 cm.
They were sculpted and painted by Karsten “Vikotnik” Radzinski for his award-winning Nosferatu game.