They are advertised as 4" on Revain and elsewhere but actually have a 3.5" outlet diameter. They are simply longer 8" versions of the other 3.5" springs Pilot offers and are not larger in diameter. The packaging even says 3.5 inches. Although they are fine. Good quality. I'll probably leave it at that, but I really wanted 4 inches. I've looked everywhere for an affordable 4 inch tip and thought I had it with this one. I was wrong.
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