This drum wall 5 has on the outside a plurality of {HEAD ~ plastic elevations} such as {TAIL ~ mandrels} 6 
This drum wall 5 has on the outside a plurality of { HEAD ~ plastic elevations } such as { TAIL ~ mandrels } 6
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH