The 150-foot Heavy Nylon Tether Line (Item #91247) is designed and tested for use on Cloudbuster balloons. This can be cut to any desired length. The nylon line is too heavy to use on smaller sized latex balloons. Any weight between the ground and the balloon on a helium filled balloon acts has additional weight (ex. ribbon, flags, lines, etc). The balloon itself and the air in the 60/40 mix also acts as a weight. Any weight interferes with the float times of a balloon. The heavier the additional weight, the more effected the float time will be; with the risk of the balloon not floating at all. We recommend only using lines and flags meant specifically for Cloudbuster balloons.