Ah you have a sharp eye for particularly strange curios my friend.

This is the Wabbajack. Said to turn a pony into just about anything. A bear, a rabbit, a sweetroll…. bah but you aren’t here to hear me babble. Please, please, browse to you hearts content and when you are ready to make a purchase just let me know.

(not sure if the Wabbajack could fit into small jar, but this is Sheogorath’s main artifact we are talking about. I’m sure it could become tiny if it darn well pleased. Maybe he uses it as a toothpick.)