Gallery Solutions Flat Black 21 Opening Collage Wall Frame Gorgeous collage frame with removable mat that holds 21 4 inch x 6 inch images Contemporary narrow frame profile and flex tab back opening allowing you to easily add and remove photos or art Frame includes ready-to-hang durable hangers on the back for vertical or horizontal hanging options Frame is crafted from durable solid wood Lightweight protective plexiglass will keep your favorite photos looking great for years