Ku boxa PP strap (polypropylene strap) kahle swina nkoka eka matirhelo ya ku paka xikan’we naku hunguta ntsengo. Nkongomiso lowu wu katsa ti parameter ta nkoka ta swihlawulekisi: ku anama (5–19mm), ku enta (0.35–0.80mm), matimba yo tshoveka (45–230kg), ku hetisa ehenhla, na swipimelo swa roll. Ku twisisa ndlela leyi parameter yin’wana na yin’wana yi khumbaka ku fambisana ka switirhisiwa, vuhlayiseki bya ndzhwalo, na ntsengo hinkwawo swi pfuna vatshila va ku xava ku boxa bandi leri faneleke eka ku tirhisiwa ka vona. Hi ku ya hi swipimelo swa indasitiri, ku hlamuseriwa lokunene ku hunguta nkarhi wo yima, ku antswisa ku tiya ka ndzhwalo, naswona ku antswisa ku durha ka swilo.