{HEAD ~ The beads} may be made of {TAIL ~ teflon}, polystyrene, polyethylene, or any other suitable particulate material that absorbs vibration energy when vibrated to cause rubbing between the beads 
made of
{ HEAD ~ The beads } may be made of { TAIL ~ teflon } , polystyrene , polyethylene , or any other suitable particulate material that absorbs vibration energy when vibrated to cause rubbing between the beads
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH