Learning Resources Interlocking Gram Unit Cubes - 1,000 Pieces, Ages 6+ Math Classroom Teaching AidsLittle learners will love using these versatile, colorful cubes for both weight and measurement activities. The youngest students can sort the 10 different colors and create patterns. Interlocking Centimeter Cubes are great tools for teaching kids counting, measuring and patterning. Set of 1,000 plastic one centimeter cubes weigh 1 g each, come in 10 colors and store in a convenient tub. activity guide included.