Each set consists of 51 pieces made from finger-friendly foam: 1 whole, 2 halves, 3 thirds, 4 fourths, 5 fifths, 6 sixths, 8 eighths, 10 tenths and 12 twelfths.

Circles are 4 inches in diameter. The magnetic part of the magnetic pieces covers the entire back of each piece. Each kit comes in a resealable bag for easy storage.