Promotional products can improve direct mail response rates and lead conversion. A study found that including a promotional product with a direct mail campaign increased response rates by 50% and generated four times as many responses compared to a sales letter alone. Promotional products also reduced the cost per response by two-thirds. These items are useful to recipients and repeat the company's message many times without additional advertising costs. The document provides an overview of promotional products and their ability to promote brands and improve marketing campaigns.