Wipe-off Sentence Strips give students a chance to practice writing and printing skills again and again on the erasable surface. Class-size packs make it easy for everyone to have the hands-on practice that delivers results. 24″ length is perfect for classroom demonstrations, printing and writing practice, word walls, story walls, spelling practice and announcements. Tri-color pack provides added flexibility to color-code your lesson plans. 3″ tall strips include standard guidelines.