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Custom Tumbler Wholesale Thermo Sippy Stainless Steel Vacuum 40oz Drink Coffee Tea Cups with Lids and Straws. Custom Logo Engraving: Laser engraved logo available for personalized branding. Premium Material Construction: Made with 304 stainless steel inner and EVA foam outer for durability. Multiple Capacity Options: Available in 750ml and 1200ml, or fully customized sizes. OEM and ODM Service: Accepts OEM and ODM orders for custom product design. Fast Sample Delivery: Free samples sent out within 3-5 days for quality check. Professional Manufacturer: Established in 2002 with over 20 years of industry experience.