Prechamber combustion has an advantage: it increases the efficiency of the engine because of an excellent ignition of the gas mixture but disadvantage is the high temperature into prechamber. High temperature is the drivingfactor for low spark plug life time,any degree Celsius less countsas it extends thes park plug life time.

1)  Grooves on the outside enlarge thesurface and allow better cooling- extended spark plug lifetime

2)  2 x higher tensile strength avoiding cracks

3)  30% higher thermal coefficiency avoiding o-ring damages and leakages!

Very best matarial, higher heat transfer what increase spark plug life time!

 4 pcs carton box or if bigger q-ty 4 pcs boxes into wooden box.