Quoted from kvan99:
Mike, those flipper links (the whites ones in the first pic) look like soft plastic, can they stand up to 1000s of cycles? I don't remember but weren't the old flipper links made from some kind of composite?
After a great deal of research and physical cycle testing on several different compositions we settled on POM (Polyoxymethylene). We have chosen a Taiwanese brand for it's consistent quality between batches and the paper trail that the supplier can provide us. It's a little more expensive than the Chinese brands but only slightly. This testing multiplied by thousands of separate parts is one of the reasons things have taken a while to get to this point. It's a tough job.
I'll let the Wiki (https://en.wikipedia.org/wiki/Polyoxymethylene) explain it better than I could but here is a short excerpt:
"Polyoxymethylene (POM), also known as acetal, polyacetal and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. As with many other synthetic polymers, it is produced by different chemical firms with slightly different formulas and sold variously by such names as Delrin, Celcon, Ramtal, Duracon, Kepital and Hostaform.
POM is characterized by its high strength, hardness and rigidity to −40 °C. POM is intrinsically opaque white, due to its high crystalline composition, but it is available in all colors. POM has a density of 1.410–1.420 g/cm3.
Typical applications for injection-molded POM include high-performance engineering components such as small gear wheels, eyeglass frames, ball bearings, ski bindings, fasteners, guns, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry."