Each set features 51 plastic pieces plus dual-use work tray/storage box and Teaching Notes. Colour-coded to correspond to all Rainbow Fraction products. This versatile product make visualizing fractions a snap and are perfect for your individual child, class, home school or tutoring groups. Set include nine circles divided into halves 1/2 thirds 1/3 fourths 1/4 fifths 1/5 sixths 1/6 eighths 1/8 tenths 1/10 twelfths 1/12 and one whole. Circles measure 9 cm in diameter and are colour-coded for use with all other Rainbow Products. Teaching Notes included.