Each pre-filled pen contains 3mL of solution for injection (100 units of Insulin Glargine per mL). Supplied in packs of 5 pre-filled pens. Store pens not in use in the refrigerator. Do not freeze. Pens in use must not be stored in the refrigerator, and may be stored at a temperature up to 86F (30C) for up to 4 weeks.