Teacher Stamps are an efficient and effective way to grade papers, provide instruction, request information and praise positive performance. This ExcelMark A-17 custom stamp features a 5/8" by 5/8" round impression area and a durable, yet lightweight, plastic construction for long-lasting use. A self-inking mount re-inks the die before each impression, making it ideal for quick, repetitive stamping. In addition, a unique, reversible (two-sided) ink pad doubles the life of the pad. Simply push it out, flip it over, reinsert and keep stamping! Each side of your ExcelMark ink pad initially lasts for thousands of impressions and is simple to re-ink and replace. A clear base on the mount allows you to easily line up those impressions.e performance.