They vary in size. Some are as long as 20 feet and 20' wide and some are as wide as 15 wide x 30 feet long and some just a few pellets together. I found the ones in 15-20' the most productive year round. I use some of them during the ice season and really do a number on the gills and crappies. Last year I had one spot that produced smallmouth bass all through the ice season, somewhere close to 30 smallmouth came through the hole next to the brush pile, the pile wasn't much larger than a 10 x 10' area.