Nording Keystone Filters, for a dry pipe and a cool smoke. Made from all natural mineral clay. Made in Denmark.
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So they are basically just cat litter tbh. They make it so the last of the bowl isn't so fowl, but they heat up when the cherry is on them making my pipe quite warm in my hand. Also they do nothing to absorb the oils left over after the bowl is finished. They get nasty after about 4 or 5 bowls. I'm kind of neutral about them, they are worth it as an add on to make your shipping free though, js.
I love this stuff they work like a charm keeps my smoke cool and dry and you get all the tobacco flavors coming through