Coyote Rollers are 4 foot long extruded aluminum tubes specifically designed to spin when animals attempt to enter or exit a fenced area, denying them the traction needed to get over a fence. I have 55 four foot sections totaling 220 feet. Also have 9 other shorter sections totaling over 20 feet. I have all the brackets needed to install.
It's simple, safe, humane, requires no power source, maintenance free, and built to last a lifetime.