The important thing here is using them properly to achieve the desired goal which is dead moles and this is how you do it: In dry weather when moles are active, go out in the evening and knock down all the mounds. Go back in the morning and you'll find the fresh mounds. This is where the moles are working. Scrape off the top of the mound and feel around with your fingers until you find the tunnel. Gently scoop the dirt out of it until you have clear access to the tunnel. Light the sulfur stick and shove it as far down the tunnel as you can and then very carefully (so as to not extinguish the sulfur stick) plug the hole tightly with dirt.