The beer filter cartridge is made of 100% 304 stainless steel. The stainless steel mesh is 300 or 400 microns in size, which in home brewers' experience seems to be the best choice for containing the hops. For particle hops, 300 microns is best for whole leaf hops and 400 microns is best. 400 micron can also be used for granular hops, but 300 micron tends to hold dust better.

These stainless steel strainers are perfect for holding hops while brewing! Known as hop spiders, hop filters, beer wort cups, wort scoop cups, hop baskets or just regular beer brew filters, they sit inside the brew kettle and hold the hops in during the brewing process. They're great for keeping hop residue from building up on the bottom of your kettle, and also help keep flat coolers from clogging.

Features: easy to clean, anti-corrosion, easy to assemble, reusable
Applications: Hops for home brewing
Packing: carton.