Well they almost certainly fall under the 100mg (that's about 150 mg of Galinalstan. The rule also requires it be carried as cargo. That is, no gallium in passe

Well they almost certainly fall under the 100mg (that's about 150 mg of Galinalstan. The rule also requires it be carried as cargo. That is, no gallium in passenger aircraft. So technically it would be illegal. However it's extremely improbable any amount of gallium would be able to escape the devices enclosure much less make it past the furnishings to the actual aircraft structure. Much less an amount likely to cause problems. My advice is to not mention it.