The device contains a plurality of {HEAD ~ bristles} secured to {TAIL ~ the inner surface} of the inner wall 
secured to
The device contains a plurality of { HEAD ~ bristles } secured to { TAIL ~ the inner surface } of the inner wall
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH