I can personally recommend this seller! I bought a necklace just like this a while back, and it's well-made and durable! The foam backing works really well to make it comfortable and not sharp.
I have no problem being a walking billboard for my favorite brand of calorie-water. Here are some other awesome search results related to Dr. Pepper from Etsy!
Don't forget to comment with links to your black-colored items, for possible inclusion in my next color feature!