Silicone Transparent Straw Mug - Type: Straw Mug - Material: Silicone - Color: Transparent Thank you for viewing. I'm sorry, this is a replacement part for a straw mug that I purchased two years ago. I don't remember exactly, but it's a part for a Thermos straw mug. It has not been used, but it has been stored at home, so please only purchase if you understand this.