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Need Help with Science Fair Hypothesis

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So, I'm working on my science fair project, and I'm at the point in the data analysis where I need the null hypothesis and alternative hypothesis. The null hypothesis is simple enough, but I'm having a lot of trouble with the alternative hypothesis. See, it needs to be a directional hypothesis, but my independent variable doesn't really accommodate one.

In my project, I am testing different plectrum (music pick) materials to find how pitch is affected by the material. My materials are: cardboard, foamboard, wood, rubber, and 3D-printed plastic.

A directional hypothesis would need to be something like "as temperature rises, the density will decrease", but I just can't think of one that would work when the independent variable is more qualitative than quantitative.

If any of you have any suggestions or tips or anything like that, I'd be happy to hear them.

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