The Doff Slugs Be Gone Defence Gel is a colourless, odourless, non-toxic gel that forms a barrier which protects plants from slugs and snails. It's made from natural ingredients and is completely harmless to children and animals including birds, dogs and hedgehogs. This slug and snail deterrent is effective in wet weather as well as dry conditions and lasts for up to two weeks. Size: 1L. Provides up to 50 metres of a rain-resistant barrier.