Set of 390 UNIFIX BLOCKS Mix of 10 colors Good used condition Normal wear Smoke free pet free home Some have color bleeds Recommended Age 4 yrs. - 8 yrs. / Pre-K - 3rd gr. Counting, place value, patterning, measuring and more...these easy-linking cubes provide a concrete way to explore a variety of early math concepts. Plastic cubes come in 10 colors; each cube measures 3/4" Develops skills in counting, comparing, sorting, patterning, number sense, place value and simple operations.