cylindrical

E26, bulb NOT included. Compatible bulb Type: Tubular LED; Compact Fluorescent (CFL); Halogen; Incandescent. (60W max)
Crafted of 100% copper metal,not steel or aluminum.The stretch arm was crafted of copper also but painted with black color to give a harmony feeling.
Hardwired (Installation required); Includes all mounting hardware for quick and easy installation. Dimension of mount plate base: diameter at 12cm (4.7″) and deep at 2cm (0.8″). Rod arm length 9cm (3.5”) extend from mount plate to elbow joint at 90 degree.