The Doff Slugs Be Gone Wool Pellets swell, forming a protective mat that contains minute abrasive fibres and particles that irritate the slug’s foot. The felt-like mat also acts by absorbing moisture from the slug’s foot, which makes it difficult for them to cross the barrier. As the material naturally degrades, it slowly releases beneficial nutrients into the soil. Doff Slugs Be Gone Wool Pellets are suitable for a variety of garden plants, including fruits, vegetables and ornamentals. They also bind together helping to retain moisture, so plants require less watering and are ideal for pots, flower beds, baskets and tubs.