Cobweb

Cobwebs can trap zombies in it. Zombies that are sticking to it can eat it, making it not invulnerable, however Cobweb can deal very light damage to the zombies that are sticking to it. A maximum of 5 zombies can stick to it. After 5 zombies are trapped, the next zombie that passes by will just ignore the Cobweb.

Suburban Almanac Entry
Cobweb

Cobwebs can trap zombies.

Cobweb once tried to trap a spider, it did not work as planned...

Cost: 250

Recharge: Slow

Trivia

 * It is a pun on "cob" and "cobweb".