Custom sized mouse pads

I’m looking for a protective pad to cover the tops of some painted shelves right inside my main door that tend to take a beating as they collect keys and ‘stuff’ as people come in the door.  Your mouse pads might be what I’m looking for.  Can you really do custom sizing?  I need 2 sized 28.5×21 and potentially two others at 33×21 if I like the first two.  I would want them in either a very very dark brown or black.