Welcome to the new and improved Proflex / K2 Tech Forum!
Hi C/kiwisintered brake pads contain more metal particles in the compound - normally some form of copper.This gives a harder compound - the upside is that the harder compound provides a longer lasting disc pad. Great for muddy, UK winter conditions or sandy gritstone as found in the Penines and Yorkshire etc.They tend not to glaze over quite as easily as organic pads.Sprucey