Wipe-off Sentence Strips give students a chance to practice writing & printing skills again & 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 & writing practice, word walls, story walls, spelling practice & announcements. Tri-color pack provides added flexibility to color-code your lesson plans. 3" tall strips include standard guidelines.