Metallic Cartisane Gimp is available in five colours. Each pack has a 1 metre length and is 3mm wide. It has a wired plastic centre that is flexible and can be bent to shape. I used a similar thread to this when I studied in Paris, so am really looking forward to having time to play with this!
Here’s a link to the silk version: https://alisoncoleembroidery.com.au/product/silk-cartisane-gimp/