These unique mismatched earrings feature microscopic objects responsible for cellular metabolism - a mitochondrion and a group of its ATP (adenosine triphosphate) molecules, which help cells generate energy to power our bodies. Both are clear coated to protect the printed images, which are on post-consumer paperboard. They are perfect for environmental educators, scientists, and nature enthusiasts. Made in Bellefonte, PA. Images measure about 1 inch.