Keep butter soft and fresh for up to 30 days. Simply pack the bowl with 1/2 cup of butter, fill the crock 1/4 full of cold water, and turn bowl upside down into water. Water forms tight seal to keep butter fresh. To serve, lift bowl out of crock and turn right side up again. Similar to centuries-old French butter storage system. Heavy, durable marble. 4"Hx31/2"OD, 11/2 lb, imported.