There are small scratches and stains on the surface (as shown in the photos). Please refrain from purchasing if you are concerned about this. The cooling capacity is not affected. I mostly used it with water, so I don't think there is any discoloration from tea. THERMOS Vacuum Insulated Baby Straw Mug FJL-350 Yellow White (YWH) 350ml New straw included. Shipping via Rakuraku Mercari courier service (Takkyubin) Material: Inner bottle: Stainless steel / Body: Stainless steel (acrylic resin coating) / Lid/Cap body: Polypropylene / Drinking spout: Silicone rubber / Straw: Silicone rubber / Packing: Silicone rubber / Handle: Polypropylene / Bottom cover: Silicone rubber Item Weight: 0.2 kilograms Capacity: 0.35 L Contents: 350 milliliters Type: Mug/Straw Mug