美国采购需求：哑铃杆、哑铃杠铃、PU哑铃、短哑铃杆、短哑铃杠铃、哑铃

I am looking to purchase one pair of dumbbells weighing 10kg each. I'm interested in understanding more about the specifications, including the materials used, the different finishes available, and whether they come with any customizable options. Additionally, please provide insights on the packaging details for shipping and any bulk order discounts available. If you have any recommendations or alternative sizes that could meet similar requirements, I'd love to hear about those as well. I would appreciate a prompt response with your catalog or pricing information, as I am eager to move forward with this order soon. Thank you!