Common photo sizes include 4 x 6, 5 x 7, 8 x 10, and 11 x 14. Some frames include or support mats to fit alternate sizes.
They typically include hanging hardware for wall display and an easel stand for tabletop use. Common mount types listed are hanging triangles and sawtooth hangers.
Most listings specify a shatter-resistant glass front to protect photos.
Backings are often velvet slide-in or smooth velvet; some frames also include a sturdy backboard and turn points (tabs) to hold photos securely while allowing easy swapping.
Yes — these frames are designed for both horizontal (landscape) and vertical (portrait) display.