On the 3 larger models, they are FUD. I scrubbed them with soap and water, lightly sanded off some rings left by the printer, and painted them with Krylon metal paints. I was amazed how much detail popped out when I put the paint on. The smaller model on the chain is stainless steel. I'm happy with how much detail it has for such a small object.
Thanks! I really appreciate the compliment. I've done my share of experimenting with different materials and paints. I think I found a good combo.
Hey bdeaver, that's a very impressive effect! I show cased it in Friday Finds this week, alongside a couple of metal pieces. https://www.shapeways.com/blog/archives/1030-Friday-Finds-3D- Printed-Designs-From-the-Shapeways-Community.html