Reusable. Demonstrate sentence building, writing, grammar and punctuation or even math equations on your magnetic whiteboard. Pass them out and have the students bring them up when they're complete. Each strip measures 24" L x 3" H. Ruling measures 1.5" H and 0.75" H. Ages 5+/Grades K+. Each pack includes 10 strips. Bundle includes 2 packs for a total of 20 strips.