I'm not sure about the build quality and durability of the spark plugs, but you should know that: the cons: 1) the spark plugs are made in China 2) there is no 'gap' , which is written somewhere on the packaging. I had to measure the spacing of all the marks, most of them 0.037" and one or two 0.040". Knowing this, I would buy spark plugs from a rebranded European/American brand. positive 3) best price for 6x spark plugs i found.
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