Student Number Lines are a wonderful way to teach number recognition and relationships, and these are the perfect size for students to use right at their desks. Numbered 0 to 25, use these individual write-on/wipe-off number lines with Ideal Plastic Marks crayons. Featuring adhesive backs to easily attach to students´ desks, student number lines measure 24" x 2" (61cm x 5cm) and come in a set of 12 with activity sheet.