Kerf mount bubble weatherstripping

A home owner from New hope, PA says:
The casement window I have has a foam filled bubble. Can I use a foam filled or a hollow?
Do you sell both? Looking for it in white.
Thanks
Mike
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Casey from SWISCO responded:

Hey Mike,

This is no problem - hollow and foam-filled weatherstripping perform should get the job done equally as well. So, it won't matter which one you decide to go for. Feel free to let us know which ones you're between if you want another opinion!

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