These rings are printed using PLA (a plant based plastic) and weigh less than 2 grams each and can be completely customized! I currently have over 100 colors you can pick from! Check out the last photos in the collection for labeled swatches, or simply describe what color you'd like and I'll pick the closest. (You can also check out http://color.fran-web.net/Filament/ for the most current index of available colors) While most of the filament I use to make these rings is made in the US, some of it does not specify country of origin. If the ring you order has a high likelihood of repeatedly being in someone's mouth, please let me know and I will be sure to use only US made filament in it's creation.