Agate Marble. Banded Bulls Eye. Around 1 1/2 Inch. Natural Gemstone mined from the earth. This was imported many years ago. You might call this a large round bead for making jewelry. Photo shows box of all 13 pieces available, but price is for one piece. I have lots of marbles and it is too much work to show photo of each one individually. I will try to pick out your interested marble from the photo.