This industrial-style piston dock is made from a 1940's radial engine piston called the WWII Jacobs R-755. The piston was used to power such airplanes as the Beechcraft Staggerwing, Boeing Stearman 75, and Avro Anson. The piston is powder-coated in Ferrari Red and measures 5" in diameter and 3" in height. The piston dock is designed to fit an iPhone 4, iTouch, or iPod that uses the Apple 30-Pin Connector. A Plane Pieces Inc. original design, this piston dock is made in the USA. The 50-piece limited edition features hand-engraved numbering at the bottom of the charging dock. The dock comes with a 6-foot black USB cord and wall charger. The charger is designed to perfectly fit your iPhone 4, iTouch, or iPod without a protective case. It may not work correctly if you are using certain protective cases.