I wouldn't think you would want mother of pearl rollers wouldn't they wear down fairly quick since your rolling your fingers over them and also I think it may be possible they could chip or break fairly easy as well. I may be wrong, but i'm not sure the mop rollers are the best material to use.
Years ago my parents operated an arts and craft supply store and they carried plastic beads in a variety of shapes and sizes, I remember some (can't recall the name) that were shaped identically to the lowEb and C rollers on my tenor. I'm sure bead manufacturers are out there making them out of all kinds of material. search ebay for beads. that would be my suggestion.
quick search on long oval beads came back wtih this this is the shape I remember.
and there are topaz not sure of the sizes but its an option eh?
the problem with rollers is that they have to be of certain specific sizes to fit so it is difficult to adapt things such as " ovalized " beads , you might be extremely lucky for certain keys but not for all .You can have them made .....at a price, of course!
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