This product is acid-free per industry standards. Filling up a chart with stickers is a sure way to motivate young students. Label each chart with a task and a name. Then record the progress in homework classroom assignments attendance good behavior etc. These nature-inspired incentive charts with wood and soft gold design have 7 columns to accommodate all 7 days of the week! Longer spaces for headings accommodate longer names for children and their tasks. The charts have the same overall dimensions so they fit in the same space as other charts.