Three number lines marked in 16ths, 10ths, and 12ths on one side and three open number lines on the other. Mats are 9" x 12", made of durable flexible plastic. For use with dry-erase markers. Set of 10.. Great visual tool to understand fractions using a number line. High quality durable write & wipe mats. Great visual tool to understand fractions using a number line. Mats are 9" x 12". 8-11 years. Grade 3-5