Need a weight? Yea, probs.
Most of these weights are designed for 12-15 balloons.. there's some science here, but that's about the gist of it.
If you're getting some of big-ass balloons, we recommend one weight/balloon.
If you're doing a big cluster, we recommend a custom weight - We custom make this to be heavy enough to hold just about any quantity of balloons down.
Not sure what you need, holler at us ;)