This 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 buffed to a shine for a sleek look. This J-Cobs Piston Dock for Lightning devices is marked with a Flying Monkey Stamp. It measures 5" in diameter and 3" in height. The dock comes with an Apple Lightning USB Cord. The charger is designed to fit your iPod or iPhone without a protective case. The 80-piece limited edition features hand-engraved numbering at the bottom of the charging dock.