| http://www.w3.org/ns/prov#value | - Although the base 100 may be formed of any material, such as wood, it is preferably made of a material such as PET, polypropylene, no-break polypropylene (polypropylene with added ethylene for extra resilience), filled polypropylene (the filler could be either glass or talc for extra rigidity) or PET. The various walls, flanges and the like of the base 100 may be about 0.15??? thick.
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