The gel (from Yaley) sold at Michaels and other craft stores is definitely LOW density. When I first started making gel candles, I contacted Yaley and inquired about that and their response was that it is Low density gel. When you put a chunk of each side by side, the medium is much clearer. You can even feel the difference when handling it. Low density feels very oily compared to the medium density. Suspending items in low density won't take long until they sink to the bottom. Last but not least, low density can't hold as much scent as the medium can. So for those of you who already have the low density (craft store stuff referred to above), I would suggest you get a sample of a true medium penreco, and do these comparisons. There are differences!