Had these installed roughly five years. When replacing my gutters I opted not to install them because a big storm took down all of the pine trees that made these gutter guards necessary in the first place. According to Leaf Filter's literature (which I can provide to buyer) the mesh is surgical grade stainless steel. These install on standard gutters using self tapping screws (which cost about $2 for two dozen at Lowes & Home Depot). Twelve full pieces that are five feet in length plus a small little section (see photo). These cost well into the thousands new (over $2300). Selling for $200 cash firm. I sprayed them down with a little soapy water but they could still use a good scrubbing.