Well the Colorless Pokemon caps i ordered in " Frosted Ultra Detail " as pictured here:
http://puu.sh/gxy1s/f94ed17dff.jpgThis material is Hard and feels very much like a normal key however it has like a "slippery" ? feel. Like it feels like you are touching a candle (like really smooth but not plastic) JUST A LITTLE. its very pleasant.
The other keys are printed in colors such as "pink Strong & Flexible Polished" these keys feel a little different then normal keys, i cannot described it but overall they all feel very strong, i thought 3d printing would be weak or crap quality but im actually really impressed.
worth noting all the keys provide some light through them which was a big + for me. some colors a little less then others (lighter colors let more through).
tried my best to describe em sorry if my description sux, but they look great, they are sturdy and have some light-through. 10/10 would buy again