Sheet lead from chimney flashing is one I use. Cut to size with scissors or shears (if you have them). Try not to sand it or letting kids play with it as lead accumulates in the body and can lead to developmental problems for kids if absorbed/ingested in sufficient quantities by them. But it should be safe in most weighting applications. Tire balancing weights are harder to find, but another option.

A final option I have used is pennies, although newer ones are getting lighter and not as cost effective.

Dave

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