From what I can see their scent chambers have a bead stuffed inside a weed guard with a chain swivel and a wire threw the bead with a loop on the end, I have been playing around with weed guards a little, I dont like paying $2 a piece for a chain swivel with a piece of plastic tube over it. Anyway long story short depending on what you want to use for scent and how thick it is, a simple weed guard chain swivel seems to work ok. You can pretty much fill it up and it will last for anywhere from an hour to 3hrs depending on exactly how thick it is. I have been running 2 rods with and 2 rods with out this year and so far have not noticed any benefit, its hard to tell for sure though, I would imagine some days it might make a big difference other days not so much, or maybe I just haven't found the scent they like yet. I like it because you don't end up with a bunch of sticky slimy stuff all over your gear.