Rockler Woodworking and Hardware’s Koostik Kit is a freestanding wooden cradle that fits any model iPhone and uses passive amplification to boost the iPhone’s sound to a higher volume. The cherry wood cradle creates acoustic properties that amplify the sound volume by two to four times without using any additional power beyond that of the iPhone. The Koostik Kit contains two regular pieces of unfinished, solid cherry wood — the faceplate and the cradle — and allows users to determine the final shape by beveling the edges if desired and choosing a custom finish to apply to the exterior. The pre-machined cradle slot fits all versions of the iPhone. The Koostik Kit (item number 45631) is priced at $49.99.