Nine circles, each measuring 31/2". One circle is whole. The other eight are divided into common fractions: 1/2, 1/3, 1/4, 1/5, 1/6, 1/8, 1/10, 1/12). Nine colors. 51 total pieces. Foam is lightweight, soft, quiet, and washable. Comes in a resealable storage bag. Teaching tips are included.