Traffic on here is a little slow, but you are right about the yellow theraband materials. But, you need to be careful and measure for a sure thing if you are looking for the .004" thickness, because I have bought lots of the yellow as it is what I use in my Killer Kegs, but sometimes what you get is .006" and .005" in the yellow ... and there are other avenues in getting the material at .004" just do a google search and you will find other places but not as cheap as Theraband for the amount you get. Happy hunting....pappy