Product review (3 stars): CONFUSING
I also thought that it was a TYPO in Amazon's description of this product that you get 3 UNITS of 105A and 1 UNIT of 106A.  I received these today.  The quality is OK.  But why would Amazon send you 3 small and one large ?  I mean who's stove has 3 small burners and one large ?  Any stove I have seen, it's 2 small burners and 2 large.  That's why I am always hesistant of ordering on line.  Next time I'll spend more time looking for them in a store.  Like the other customer who commented on here, I kept one old one.  So now I have an extra small one.