This double-sided Deci-Rods track is designed to linearly see values up to 100. Designed to fit cm cubes and Deci-Rods. One side has a single slot for counting. The other side has a double slot for comparing and computing. Both sides are labelled to 100. Track comes in two 19.7" (50 cm) long pieces. Includes 80-piece set of Deci-Rods. Grades K+.