Latigo or indian tan about a 1/4 wide works good for tying the water loop. the string will break most times before your reins incase a horse steps on them. Cut both ends to a point. It makes them alot easier to get through the holes. To tie you need to start just like you tie you shoes but take a extra turn or two crosses with the lace instead of one and you have a knot, pull it tight and you have a knot that won't come undone and it's easy to get undonel if you need to.