Echo Original Equipment SAW CHAIN 12" - MICRO-LITE - 90PX45CQ This SAW CHAIN 12" - MICRO-LITE is used here; · CS-2511T S/N: C70215001001 - C70215999999-->Chain, Guide Bar · CS-2511T S/N: C71915001001 - C71915999999-->Chain, Guide Bar · CS-2511T S/N: C80115001001 - C80115999999-->Chain, Guide Bar · CS-271T S/N: C26312001001 - C26312999999-->Chain, Guide Bar · CS-271T S/N: C26411001001 - C26411999999-->Guide Bar, Saw Chain, Kick Guard · CS-271T S/N: C26411001001-C26411999999-->Chain, Guide Bar · CS-271T S/N: C26513001001 - C26513999999-->Guide Bar, Saw Chain, Kick Guard · CS-271T S/N: C26513001001-C26513999999-->Chain, Guide Bar · CS-271T S/N: C32814001001-C32814999999-->Chain, Guide Bar · CS-271T S/N: C67115001001 - C67115999999-->Chain, Guide Bar This is an OEM Echo part.