I’m addicted to them,,, I’ve got 6 so far,,,1 clear blue plastic kayaking soprano uke, 3 mahogany concert ulkes and 1 reaaal nice Epiphone les Paul style cheryburst tenor electric acoustic.
Oh , and a rogue baritone uke with special strings that let me use regular gcea tuning so my chord shapes remain the same.
I think mine was plastic - or whatever plastic was in the 1950s :-)