I have use dankung Its ok it was the thicker round back stuff ,, So dankung could shoot lead all day ,Ive used the thin dankung that needs to be doubbled on heavey ammo anything above 12mm lead is heavy , Ive tryed square black nd also square red Its ok but has not got the kick at thera band gold ,,,But it will last longer ,, Ive tryed thera band green tubes and Its alot better than dankung in the two sizes Ive tryed cant remember the numbers of the dankung,I am wanting to try thera band tube red ,, I am up for any trades swaps or just buy enough red thera band tubes to try ,,It realy does ha