9Mm PP STR COCK COIL ikhoza kupangidwa ndi polypropylene kapena polymethyl Pentene (PMP). Polypropylene ndiye pulasitiki yotchuka kwambiri. Mbale za polypropyylene ali ndi kukana kutentha mpaka 135 digiri Celsius ndipo amagwiritsidwa ntchito poyesa celmophic.pmp ali ndi kukana kwambiri kwa madigiri a Celsius - ndipo ndiwowonekera, zomwe zimawonjezera mawonekedwe a botolo. Mbale zapulasitiki zimakhala ndi kukana kwamphamvu kwa mankhwala, zomanga zopepuka, kukhazikika, komanso zachuma.
