Hampton Art-Chalkboard Sticker: Shapes. Jars are not just for canning! Create unique gift packaging and craft storage by adding jar jewelry decor and labels (each sold separately)! This package contains six 2x2-3/4 inch chalkboard labels and one 2-7/8 inch long piece of chalk. WARNING: Choking Hazard- small parts. Not for children under 12 years. Imported.