Banksy is selling off a series of rare screen prints to raise money for an organization helping civilians affected by the war in Ukraine, where last month murals by the pseudonymous street artist popped up overnight.

Banksy announced on their official Instagram account they had partnered with nonprofit Legacy of War to sell off prints to raise money for the international charity, which helps civilians in areas like Ukraine, Rwanda and Lebanon recover from war.

Some 50 signed and numbered prints mounted on wooden frames will be available for about $6,131 each, according to the Legacy of War, and potential customers must register their interest online before a computer program selects successful applicants.