In the U.S. it would be something like this: Monoprice Cat5e Ethernet Bulk Cable - Outdoor Gel-filled Direct Burial, UTP, Solid, 350MHz, Pure Bare Copper, 24AWG, No Logo, 1000ft, Black (Alternative PID 40877) - Monoprice.com
It may not be easy to find it in South Africa, but you can contact a...