Home-organizer Tech 40pcs Chalkboard Labels Waterproof Erasable Remove Blackboard Label Stickers (20 Rectangles, 20 Ovals) 40 Chalkboard Label stickers (20 Rectangles, 20 Ovals). Works great for pint mason jars, jelly jars, spice jars, bottles, casseroles, home-made lotion bottles, wine glasses, coffee or tea tin boxes, canisters, baskets, folders, office supplies, toy bins, etc. Wide use of occasionwedding scene, party, home decoration, kitchen category, daily office, gardening, etc. These chalkboard stickers are tough as they come. They are dishwasher safe, making them the ideal labels for jars that need to be washed, and refrigerator safe, ensuring that labels for bottles placed in the cold don't get damaged.