Diameter .709 inchThickness .197 inchGrade 8 (strongest ceramic material available) You will receive 10 disc magnets. These are black ceramic disc magnets. Very Strong. They are the size of a dime. Glue them to your decorative projects. HINT: I strongly suggest that if gluing up multiple objects that you keep plenty of space between them so the magnets don't pop up in the air and stick to each other!