Perimeter Technologies Ultra Comfort Contact Pet Fencing System (Wire Sold Separately)This kit does not contain wire or flags. Dog fence wire is required to use this in ground fence system. Please see our selection of Heavy Duty Boundary Kits, Twisted dog fence wire, and Heavy Duty wire, all of which work perfectly with this system. The pet fence difference you can feel for yourself! Its one thing to make a product that keeps your pet safely in the yard, its another to thoughtfully design a fence with features that make it safer and