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I'm reaching out to inquire about the range of dumbbells you offer, specifically interested in the pricing and availability of different weights. As I'm looking to purchase these for the U.S. market, it would be helpful to get a detailed breakdown of your options, including any bulk pricing or special offers you might have. Additionally, if you could provide information on the materials used and any unique features of your dumbbells, that would be greatly appreciated. Understanding the lead times for orders and shipping details to the U.S. would also be beneficial as I plan my procurement process. Thank you for your assistance!