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China Premium Boro3.3 Single HS Code 9031809090 Logo Flask. High Heat Resistance: Made from High Borosilicate Glass 3.3 with feature of high heat resistance. Wide Volume Range: Available in volumes from 50ml to 5000ml with various grind mouth sizes. ISO9001 Certified: Product holds ISO9001 certification ensuring quality standards. Free Samples: Free samples are available for customers to test before bulk order. Flexible Customization: Offers flexible customization options including OEM and ODM services. Low MOQ: Minimum Order Quantity is just 10 pieces for sample orders. 100% Inspection: Finished products undergo 100% visual and function inspection. Fast Delivery: Average lead time is within 15 workdays for both peak and off seasons.