These color-coded cards provide students with a visual representation of place value and help them develop number sense. (Color-coding matches Sensational Math & trade; Place Value Discs) The cards are all 4" high and range in length from 2.5" to 10" depending on place value. Each set is packaged in a re-sealable poly bag for handy storage. 10 each of 4 values; 1, 10, 100, and 1,000. 40 cards total.