the elements are the caps that screw on to the body that provide the different pickup patterns... omni, cardioid, hypercardioid, subcardioid...
if you were getting the 853, alpha sound has caps for $28/each (although the new uline series caps are priced higher... i thing $46/each)
personally, i prefered the sound of the 853 over the 943/33, but they are smaller, although the 853s are pretty small already.
good luck