What are these things? Gold plastic capped straight pins found at an estate sale of a seamstress. 2.5 inches long, there were 63 of them stuck in a pin cushion, but they’re not sharp.

Found these at an estate sale in a pin cushion amongst vintage sewing supplies, and the closest thing I can find is it potentially being a straight pin for a brooch (I tried to image search and could only find it on a now-removed Etsy listing with no description). There were no end caps for the pointed end like the other brooch pins, and I’m not sure what they’re made of other than the plastic cap and possibly metal shaft.