The containers 12 and beams 14 may be made from a variety of materials, including metals, {HEAD ~ composite material}, ceramics and {TAIL ~ plastics}, but are preferably rigid and light weight 
The containers 12 and beams 14 may be made from a variety of materials , including metals , { HEAD ~ composite material } , ceramics and { TAIL ~ plastics } , but are preferably rigid and light weight
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH