Keep your butter so that it stays perfectly spreadable whenever you need it, with this Norpro Stoneware Butter Keeper. Just add cold water to the base of the stoneware keeper, and load the top with butter. The water helps create an airtight seal and will help keep the butter soft and spreadable for up to 30 days. To refill your butter keeper, just hand wash it with warm, soapy water, dry and repeat the process. Measures 4" tall x 3.5" in diameter.