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