This super set contains 156 rods numbered 1-12 made from sustainably sourced certified wood. Includes 24 'Number 1' rods and 12 each of 'Number 2-12' rods. Each rod measures between 0.39" (1cm) and 4.7" (12cm) long (numbers 1 to 12). 40 comprehensive work cards included (addition, subtraction, multiplication, and division). Each rod is colour coded to represent a number. The rods can also be used in measuring exercises. Easy to clean- A dry or slightly damp cloth with mild soap or detergent, then wipe dry. Ages 3 and up.