Check the listing for details. JustRite SI-31 FB Self Inking Metal Framed Stamp. Condition: Used. Listed at 10.25 USD. The JustRite SI-31 FB Self Inking Metal Framed Stamp is a high-quality office supply that features a durable metal frame and a convenient self-inking design. Made by the trusted brand Justrite, this stamp is perfect for businesses and individuals looking for reliable and long-lasting stamping solutions. The JustRite SI-31 model ensures precise and clear impressions every time, making it an essential desk accessory for any office setting.