I few years back I did a Kickstarter campaign to release special edition Nanoloop 2.7 carts that came pre-loaded with tracks from my album "Destroy All Presets". Unlike the normal Nanoloop GBA carts, these were manufactured with red plastic in a thin format. They look like exposed circuit boards, but they are designed to be self contained, no extra plastic shell required.
Something happened in transit and all of the carts were lost in shipping. We had to remake all of the carts in the classic gray GBA cart format and sent those to my backers. There were 3 red carts still left over, which Oliver sent me. As far as I know, there are only 3 red Nanoloop carts in existence.
This cart is on eBay now. It comes preloaded with my Destroy All Presets tracks, which you can listen to, remix, or even delete (if you hate them). There's still plenty of empty slots to write albums of your own.