TruePower 40-4026 2 Pack Safe and Simple Way to to Catch Snails and Slugs Trap Without poisons or chemicals harmful to wildlife, the trap relies on good old beer. Position these slug traps amongst bushes or other areas where you regularly find slugs or snails. Set of 2 Slug and Snail Traps, 5" dia. x 4"H, each Add a small amount of beer or other yeast based liquid. Place the lids on the traps and wait whilst they attract slugs and snails. After a few days, empty the contents of the traps and refill.