Inner frame size:

A4 inch [size 21 * 29.7cm]]

A3 inch [size 29.7 * 42cm]]

4K/open [size 38 * 53cm]]

8K/open [size 26.6 * 38cm]]

16K/open [size 26.6 * cm]]

10 inches [size 20.3 * cm]]

11 inches [size 30.2 * cm]]

12 inches [size 30.5 * cm]]

14 inches [size 28 * cm]]

16 inches [size 30.5 * cm]]

18 inches [size 35.5 * cm]]

20 inches [size 40.6 * cm]]

Small 24-inch [size 40.6*60.9]]

24 inches [size 50.8 * cm]]

28 inches [size 50.8 * cm]]

Frame size:

Regular