Fit: For Sthil Chainsaw MS311 MS311Z MS391 MS391 2-Mix MS391Z PN 11404001303. More applicable information is as follows. Shell: Our ignition coil module chainsaw made of pbt gf30 reinforced plastic, it is resistant to high pressure, temperature changes, and durable in harsh environments. Skeleton: The ignition coil concrete cut-off saw made of ppo high insulation material with excellent electrical strength, ensuring high voltage stability and no leakage. Lacquered Wire: This ignition coil chainsaw imported pure copper enameled wire from germany, with precise winding, capable of carrying high currents and more abundant energy storage. Service: 24/7 professional technical support, chainsaw ignition coil replacement partpre-sales q&a, after-sales response, and attentive support throughout the process., Manufacturer: KHYTY3 Store