A convenient tool for tracking purchase or expiration dates OXO Good Grips POP Accessories are a brand-new line of tools designed to help you make the most of POP Containers.* The OXO POP Date Dial is perfect for tracking purchase or expiration dates of pantry staples. To use: turn the dial to track by month and year or month and day. The POP Date Dial secures neatly to the underside of all new POP Container lids. Dishwasher safe and BPA free.