These cubes are exactly 1cm x 1cm x 1cm and weigh 1g each. Hence they are ideal for both length measurement and as well as functioning as weights.
In fact, they can be used effectively to demonstrate the concept of area and volume as well. Comes in 10 colours , they can be connected toe ach other, hence they can be used just as effectively for number operations and number bonding, graphing, patterning, and many more. They are truly multi-purpose. Packed in a durable plastic pail.