Feel the Difference and capture better photos with more control and less fatigue. The ProDot"s textured surface and raised button-padding allows for a more ergonomic feel and an instant improvement to the most critical engagement point of the camera, its shutter button.The Custom SLR ProDot (2 Pack, Clear) applies easily to any clean flat surface with a residue-free adhesive. It measures 9.8 mm in diameter and fits most camera shutter buttons.