●Material: Aluminum ●Size:1.96inchX1.18inch thickness:0.039 inch diameter of hole:0.11 inch ●They can be engraved or stamped. ●Since the material is aluminum, its easier to be stamped than stainless steel. ●They are polished and no sharp edges. ●You may use these to DIY your own number tag, name tag, dog tag or other pet dog. You may also use it for craft projects.