Judging by the the fact that I’ve never noticed these items for sale anywhere, the material’s sheen, the fact that the shapes are all symetrical from any side view, and my personal experience with the material, I’d say they may well be made from solid black Delrin (homopolymer acetal) rod, custom turned on a lathe, and therefore basically a “one-of-a-kind” device (which seems quite credible for someone like the Kink corporation to have as a photo prop item).

If my memory serves me well (I once worked with some, over a decade ago…), Delrin is a high-grade plastic which has a naturaly greasy/soapy feel (like Teflon), machines EXTREMELY well, and can be easily “polished” to a satin-gloss texture for “easy clean-up” (and even possibly “autoclaving” in boiling water… after all, it’s FDA, NSF, USDA & 3A Dairy approved…). It has many of the desireable characteristics of brass (or even stainless steel!) without the icy cold feel.

If you’re serious about duplicating these toys, any large local plastics distributor should be able to sell you the rod, and a local machine shop could turn and “polish” it for you.

Also noteworthy, it’s VERY dense, so you might like the heavy feel…

And I love her expression in the first photo, it’s like they didn’t tell her what the shoot was going to be about, just sat her down in front of the (Dildoes? they look to big to be called ‘butt plug’) implements and she is thinking “I know where This is going. . . “