For those looking for a unique marker that won't be the same as others. It seems to relax your tension during putting. It will make your golf more enjoyable as others will likely react to it. The golf hat clip can be used on hats, belts, and pockets. Approximate: Cap clip: 20x26mm Ball marker: 2.5mm There may be slight color differences in some product photos due to display color temperature, camera, ambient light, photography skills, etc. Please understand that there may be slight size differences due to different manual measurements. It will be shipped by regular mail.