The beads 21 are preferably commercial stock plastic beads of the type commonly available for {HEAD ~ plastic injection molding} of {TAIL ~ commercial plastic parts} 
of
The beads 21 are preferably commercial stock plastic beads of the type commonly available for { HEAD ~ plastic injection molding } of { TAIL ~ commercial plastic parts }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL