These are Cambro's 1252SLB250 half size printed StoreSafe food rotation labels. They are very convenient and dissolve completely off of any container in less than 30 seconds through the dishwasher or under hot or cold running water. When in use these labels are capable of withstanding temperatures of up to 200° F (93°C) for 4 hours and temperatures as low as 40°F (4 °C) in the freezer. For an added convenience, each label is microwave safe. Great for clear labels and date prepared contents in food pans and storage containers. These StoreSafe food rotation labels are safe for all sewer and septic systems, resulting in zero buildup in drains after use.