Slug Gone Wool Pellets are 100% natural and very effective at repelling slugs and snails as well as being a very effective mulch. Once the pellets have been spread over the surface and watered, they expand and form a mat, which will not blow or wash away. The fibres in the woollen pellets stop the slugs and snails by making it uncomfortable for the slug or snail to crawl across. The pellets also form an effective mulch, which reduces moisture loss from the soil and suppresses weeds. They eventually break down to release plant nutrients into the soil. 20L Bag for mulching borders.