Hollywood films today often follow a production line model and practice vertical integration, sharing many common characteristics. Producers put together packages including treatments, cast details, directors, and locations to pitch to studios for financing and production. Major studios still in operation include Warner Bros, Sony Pictures, Paramount, and Universal. Blockbuster films aim for simple storylines and characters with broad appeal, focusing on visual spectacle over dialogue to create an "impact aesthetic." Their huge budgets require global profits from various distribution channels and merchandise licensing.