The exterior of the speaker sits flush with your drywall, giving it a sleek and smooth appearance. Once your in-wall speakers are in place, you can connect it to the power and amplification sources to get that rich, deep sound you want in your outdoor space.
Drying oils will change from liquid to a solid film when exposed to oxygen in the air. Nut oils (boiled linseed, tung, etc.) are drying oils, but vegetable (peanut, olive) and mineral oils are non-drying. Edible mineral oil is popular on food contact items, like cutting boards. However, non-drying oils stay wet indefinitely, and they will wash off when the board is scrubbed with soap and water. Because they do not dry to a solid film, non-drying oils are considered a wood treatment, but not a finish.
The low cleansing properties of olive oil make it very mild and nourishing. Soap for sensitive skin, elder skin or baby skin should include high amounts of olive (60%). Castile soap is made with 100% olive oil. I classify this as a soft/hard oil because it makes a very soft bar of soap initially upon unmolding but cures into a rock hard bar.