Add a touch of nostalgia and charm to any job or incentive chart with Colorful Chalkboard chart seals! Each pack includes 810 seals! Self-adhesive Chart Seals are acid-free and lignin-free and measure 3/8" in diameter and each pack includes 810 seals! Available in a wide variety of colors and shapes, chart seals are an excellent addition to any teacher's desk! Chart seals have assorted colors and designs on each seal! Look for coordinating products or designs to create a cohesive, designer classroom theme!