the conditions have to be right to use them. very cold weather, snow on top of the ice and thick ice helps. they are used with live bait. you have to set the weight juuuuust riiiiiiiight so it tips up with little resistance when the fish hits. origin of the name "tip up" i believe. you do this by making a loop in the line or putting a ring in it then hang it on a little nail in the end. most run several of them in a line like 50 yards long. they work good when the fish are scattered and you have 2-3 people to run them. i live on lake champlain, i dont use them.