from uncle jim? its the super reds. The issue with purchasing other worms such as the canadian night crawler is that they need a colder climate year round and they arent good at composting. they also need deeper soil. Uncle jim's worm farm company was meant to be a vermicompost company. so they would stock up on worms that would fit the job for the gardeners. I am still monitoring the 1000 worm medley that i purchased. they seem to be long enough but dont fit the girth for an adult ray. maybe for ray pups. this can be used as treats though. I mean you can use them for adult rays but you'd be feeding atleast 50 at each feeding PER RAY. so you'd deplete your worm population pretty quick. though i am trying to get my rays on something other than worms. its a pain to keep feeding them worms. especially since i dont have a large enough population.