Weigh them! Measure them! Brightly colored interlocking plastic cubes each measure one cubic centimeter and weigh on gram. Bags of 250.
Oakley STEM Center Lending Library
https://www.tntech.edu/stem
155 W 7th Sthttps://www.tntech.edu/stem
Cookeville, 38505
USA
(931) 372-6573