The Snail and Slug Barrier protects your potted plants and trees from slimy slugs and snails. This anti-slug deterrent is a 20' copper mesh tube that acts like an excellent electrical conductor. The snail or slug's natural secretions react with the copper, creating a small current of electricity to be conducted from the mesh to the snail / slug. This small shock of electricity acts like a deterrent, preventing any unsolicited visits from snails and slugs.