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Another alternative is popsicle sticks. They are round and made of paper. They are basically rolled paper, so you can cut them lengthwise and unroll the stick down to the size you need. Then you cut off the excess, the. lay some glue along the cut of the piece that’s left to keep the rest from unrolling.

You can find them in a good confectionary store or order them online. They come invarious lengths and diameters.

Tamiya makes a cotton swab for modeling with a VERY thin — 1.5mm — paper stick. I’ve cut off the cotton ends and wound up with about 6cm of usable stick; if you remove the cotton instead of cutting it off, you get a stick that is about 7.5cm long.