block frame

Block frames are commonly made from MDF (medium‑density fiberboard). Other materials used include metal (typically aluminum), plastic, and wood.

Photo openings vary widely. Common sizes include 4 x 6, 5 x 7, 8 x 8, 8 x 10 and up to 11 x 17. Some square frames accept 12" x 12" or 12.5" x 12.5" record‑size images when the mat is removed.

Many frames include white mats; some are beveled or labeled acid‑free. Several frames note the mat is removable so you can change the opening or display larger images.

Common finishes shown include black, gold, or a combined black‑and‑gold finish.

Care instructions typically recommend spot cleaning or wiping the frame clean.