I came across some broken knitting pins, and I was curious at the material the were made from.
One of the needles ( I assume it was a knitting pin, but the point and knob had broken off, it was with a bunch of other knitting pins), was wood encompasing an inner needle of plastic, while another needle was plastic yet hollow. Both needles were 8mm
I was wondering if anyone could perhap enlighten me on what would be the purpose of these materials, flexibility, to stop them from breaking?
Are there any possible links, books, or articles you could suggest that might help me understand why use these needles over just plain plastic or wood needles?
I think you've got two of the reasons: flexibility and strength. I'd also add weight, cost to the manufacturer and simplicity of manufacture. Here's an article that touches on the different materials.
I wonder why someone would save a broken needle?