美国采购需求：皮带，男士 Polo 衫皮带，男士正装皮带，耐用皮带，男士西装皮带，深棕色皮带

I hope you're doing well. I wanted to get some clarification regarding the materials available for the product options we discussed. Specifically, I'm interested in understanding whether you provide a leather option or if the only alternative is cardboard. Each material has its own appeal, and I want to ensure I choose the best fit for my needs. Additionally, if there are any differences in quality, durability, or cost between the leather and cardboard options, I would appreciate your insights. This info would help me make a more informed decision moving forward. Looking forward to your response!