  
   Size
   Without Frame
   Art Box
   Oak Frame
  
    S
    51 x 26
    52 x 27
    53 x 29

    M
    63 x 32
    64 x 33
    66 x 35
  
    L
    79 x 41
    80 x 42
    82 x 44
  
    XL
    96 x 49
    97 x 50
    99 x 52

All dimensions are in centimetres