This butter container features a silicone seal that traps air and keeps butter fresh while not mixing flavors with other foods in the refrigerator. The butter holder is deep enough not to stick the stick of butter to the top of the lid. The silicone ring is removable for easy cleaning. The knife is separated on the butter cover, so you don't need to position the knife when using it. And the groove space is large enough that you can easily remove the knife. You can also use the lid as a small butter cutting board for your kitchen or outdoor grill, which is convenient and practical.