Finding the ideal tool for your groundwork is not easy.
Well, the Walhausen Lead rope 4,2 m is a must for any horseman.
This lead rope is basically unbreakable, even though I'm never about pulling on a horse. 
It has enough weight to sit in your hands easily and safely. It is easy to handle, won't burn your hands in case of friction and can't get tangled.
4,2 metres length allows you to be at a safe distance from your horse if needed but it is not so long that it needs to be coiled to avoid getting in your feet.
One of these will last you a lifetime!