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You can use copper strips along the edges of raised beds. The slugs and snails try and cross the copper and they get shocked due to a chemical reaction between their slime and the copper. I am not sure how the penny ball works. The newer pennies are mostly zinc.I love the idea of a penny ball but I don't get how to use it. Do you roll it around the yard every now and then to leave the coppery flavor on the soil?