Want some really fine, surgical-grade stainless-steel spring tubing? These are ideal as compliant legs on small creatures, and as tactile sensors on larger ones. Exactly the same as the ones found on Mark Tilden's Unibug series of robots. Measures 1.77mm(.07") OD, 10 inch long.

NOTE: You may have to use silver alloy solder and/or a high temperature soldering iron to make successful connections to this spring tubing.