These rugged inspection stamps come in four different sizes (1/4, 3/8, 1/2, and 5/8 diameter). They are ideal for paperwork, quality control, and product identification. The handles are easy to grip and small enough to fit in your pocket. Each cap holds a felt pad for short-term ink storage. In addition, all stamps are molded with Buna-N synthetic rubber in a solid rubber plug. This eliminates the die separation that occurs with glued together stamps. These quality inspection stamps may be used with separate ink sources such as the Mark II, Opaque, and Stone Pads.