3-1/2" Folding Carbon Fiber Key Organizer, Black Dimensions: 3 1/2 in. X 1 1/8 in. X 7/8 in. Weight (with no keys): 1 oz Barrell Outside Diameters: 3/16 in. ; 4mm Holds standard door keys and most car keys; Fits comfortably in pocket Includes washers (add or subtract as needed), two different size holding barrells (small-6 keys and large-8 keys), and key ring attachment No fingerprints, Made from lightweight carbon fiber (1/16 in. thick) Keys rotate 360 degrees with comfortable resistance, Large keys rotate 180 degrees