It’s steel wire brush use for cleaning rust or moss and this brush is extremely strong and long lasting. The Wire (tar) brush has to be washed and dried after use.
://www.logpri.com/product/li6-heavy-duty-steel-brush-for-cleaning-rust-and-moss-set-of-2-pics-6-rows-stainless-steel-wire-brush-tar-barash-kaai-aur-eta-saf-karne-ke-liye/