The OXO POP Brown Sugar Saver is a reusable terracotta disk that brings an end to rock-hard brown sugar by keeping it soft and fresh.To use:Soak the saver for 15 minutes, pat dry and then secure to the underside of the POP Container lid. Re-soak as necessary to keep things fresh. Do not wash with soap.Fits all POP Container lid types. Recommended for use with the OXO POP Container, Small Square Short (1.1 Qt/1 L), sized for 1 lb of brown sugar and the OXO POP Container, Rectangle Short (1.7 Qt/ 1.6 L), sized for 2 lbs of brown sugar. *Only attaches to POP lids with circular holders on the underside, available as of August 2019. BPA free.