A solid mass of silicon rubber is called as pad. It is available in different shape, size & hardness. All the pads are tapered & sloped at the side. The taper pad influence the ink pick up, ink transfer, print quality & print size. Even the surface tension of the pad influences the print quality. A new pad with smooth surface has good ink picks up & transfer property.
It is very important to use the correct shape and size of the pads in relation to the printing image, try to use the pad with the largest possible volume to obtain best results without distortion. Due to high mechanical deformation a pad of the small volume may not give good quality print on the object. Also because of the mechanical stress the life of the pad is shortened.
Use a pointed and hard pad to reach small characters and details. Soft pads create air bubbles enclousers on printed surface.