SplinterGroup
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These are interesting alone for their size. I can sand bigger parts by just placing them on a cheap yoga mat to keep them from moving, but small stuff has issues.
I've got just about anything designed to stop movement short of CA glue... well I have CA, but don't use it.

I've used thos dedicated white mats, bulk bought non slip (bathroom) mats, bench cookies (bought and shop made), Rockler silicon mats as non-slip... even have Fe$tool non-slip strips built into some workbenches,

even non-slip foam rubber mats I use to make my bench cookies


Unfortunately with small part, the vibration from the sander will rip it out of my hands or I finished up with finger nails manicured down to the quick.

Not everyone has my issue... or even a dodgy hand like me, however, some may find these useful... at least handy if you have a vacuum pump.

If your first cut is too short... Take the second cut from the longer end... LBD