From the product description, check product page for current description, price and availability:

• MATERIAL– our beer filter is made of food-grade stainless steel, resist rust, corrosion, heat, and pressure,300 Micrometre stainless steel wire mesh( will not wrinkle or damage easily),uniform porosity, good filtering performance,resulting in a clearer beer and better taste;
• EASY TO USE– our hopper strainer is an awesome addition to your home brewing equipment, better than the mesh bags because it sinks to the bottom of the keg without having to weigh it down with anything, allows’nothing’to escape except the flavors of the hops;
• EASY TO CLEAN– turn the hop filter upside down and sprayed the mesh strainer from the outside to rinse the remaining residue. Cleans very quickly and easily in the sink and simple to store for next reuse of home brew strainer,we recommend you cleaning it immediately after use;