3 years & up. Make learning about numbers and counting fun with this set of Easy to Grip Giant Number Stamps for Math Practice, Art, and More! These 10 stamps include numbers 0-9. Children will enjoy practicing addition, subtraction, or patterning through art. This activity promotes fine motor skills, early math skills, and color recognition. Stamps feature a comfort grip handle, see-thru top, and a plastic storage case. Each stamp measures 3"D.