The pendulum bob is hollow and made of brass plated steel and is painted grey on the back It measures 7 l/2" including the bottom screw, and 6 1/2" just the bob and stem. The stem is made of cherry stained wood and is 5/8" wide and on top is a brass hanger with 2 hooks. The bob itself measures 3" wide. Perfect for your clock projects, stemapunk art, metalworking and etc. Thanks for looking!