We have different colors and designs of Medallion.
Here is some regular size for your kindly reference,
1.Square: 18''x18'',24''x24'',30''x30'',32''x32'',36''x36'', 48''x48'',60''x60'' etc.
2.Rectangle: 24''x36'',36''x54'',36''x60'',48''x72'' etc.
3.Round (diameter): 30'', 36'', 48'', 60'' etc.
4.Oval: 24''x36'', 36''x54'', 36''x60'', 48''x72'' etc.
Customized sizes and designs are welcome.