This badge back requires a half-day or one-day badge front for use. Combine the front and back to activate the expiration, and the badge will show as expired after either a half day or full day (12-14 hours). This badge back is slotted, meaning it requires a card clip or attachment of some kind for use. The badge back features a green bar with printed "CONTRACTOR" text for convenient role recognition. Each badge back measures 3" x 3".