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I'm interested in sourcing a high-quality mattress with dimensions of 140 cm by 190 cm. Can you provide details on the available options? Specifically, I would like to know about materials used, firmness levels, and any certifications for quality and safety. Additionally, please share your pricing, lead times for production, and minimum order quantities. If you have any recommendations for the best-selling models or current promotions, I'd love to hear about those as well. Looking forward to your response!