The acerra is a special container for sacred incense. As with the turibulum, in the ancient Roman world the acerra could be made from a variety of materials and designs.
An acerra for your home altar should be some sort of covered container that will keep your incense "fresh." Resins such as frankincense can sometimes absorb too much moisture, or even lose some of their scent if left uncovered for weeks at a time. A pottery container with a lid, or a decorated metal or wood box can make a fine acerra.