Student Number Lines provide the perfect reference tool to teach number recognition and relationships. Numbered 0 to 25, use these write-on/wipe-off number lines with Ideal Plastic Marks crayons. Featuring non-adhesive backs, student number lines measure 24" x 2" (61cm x 5cm). Each set includes 12 number lines with activity sheet. Sold as 3 sets for a total of 36 number lines.