PET strap (polyester strap) kpɔa eƒe ŋusẽ tso eƒe nusiwo wotsɔ wɔe ƒe molecule ƒe kpekpeme me, si wodzidzea to intrinsic viscosity (IV) dzi. IV ƒe didime si bɔ na PET-ka si ƒe nyonyome deŋgɔ enye 0.60 va ɖo 0.95 dl/g.
PP ka (polypropylene ka) ƒe kekeme nyuitɔ tiatia le vevie ŋutɔ na agba ƒe dedienɔnɔ, dɔwɔnuwo ƒe sɔsɔ, kple gazazã nyuie. PP strap li le dzidzenu ƒe kekeme tso 5mm va ɖo 19mm. Ka siwo le gbadzaa wu (5–9mm) sɔ na kakɛ siwo me kɔ kple asitsatsa to kɔmpiuta dzi, gake ka siwo keke wu (12–19mm) ya kpɔa pallet kpekpewo kple dɔwɔƒewo ƒe agbawo gbɔ.