Loaʻa i ke kaula PET (polyester strap) kona ikaika mai ke kaumaha molekala o kāna mea maka, i ana ʻia e ka intrinsic viscosity (IV). ʻO ka laulā IV maʻamau no ke kaula PET kiʻekiʻe he 0.60 a 0.95 dl/g.
ʻO ke koho ʻana i ke kaula PP kūpono (polypropylene strap) laula he mea koʻikoʻi no ka palekana o ka ukana, ka hoʻohālikelike ʻana i nā mea hana, a me ka maikaʻi o ke kumukūʻai. Loaʻa ke kaula PP ma nā laulā maʻamau mai 5mm a 19mm. ʻO nā kaula ʻoi aku ka liʻiliʻi (5–9mm) kūpono i nā pahu māmā a me ka e-commerce, ʻoiai nā kaula ākea (12–19mm) e mālama i nā pallet kaumaha a me nā ukana ʻoihana.