ʻO ka upena hōʻoiaʻiʻo e like me ka puka makani, me ka ikaika tensile kiʻekiʻe, ka pale ʻana o UV, ka pale ʻana i ka wela, ke kūpaʻa wai, ka pale ʻana i ka corrosion, ke kūpaʻa ʻelemakule a me nā waiwai ʻē aʻe, ʻaʻohe mea ʻawaʻawa a ʻono ʻole, ʻo ke ola lawelawe maʻamau 4-6 mau makahiki, a hiki i ka 10 makahiki.ʻAʻole wale ia i nā pono o sh ...
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