I am making a basic spear with a deer leg bone tip.  I have it the way i want but am wondering what i should wrap it with.  The wood is an elm sapling i cut down and i made a notch in to put the point on.  It is pretty stiff so i will need something fairly strong.  It is starting to split down farther than i want it so i also need something to wrap so it does not split farther. I am very new at this and any help is welcomed.  
Thanks