This set includes 100 one centimeter cubes, 30 rods (composed of ten cubes to represent the tens' place), 10 flats (composed of 100 cubes to represent the hundreds' place), one cube (composed of 1,000 cubes to represent the thousands' place), plus a copy of Base Ten Blocks Activities, a 96-page reproducible book that explores number operations, place value, area, volume and fractions. Also comes with teaching notes. Please note that the 100 centimeter cubes do not have a mass of 1 gram or displace the equivalent volume, so they cannot be used in place of gram/centimeter cubes.