Copper tubing?

Thank you for all the responses and ideas! I am still on the
search for this tubing: copper tubing with a quarter inch
diameter that is hard tempered straight stock and is longer than
12 inches. I should have mentioned that I needed a longer length
in my original post. I had made the rounds at local
hardwares,plumbing suppliers and refrigeration suppliers. As many
of you suggested I am now contacting hobby and model shops
hoping I can find some of this tubing in the longer lengths. I
may also try the draw plate suggestion and draw some of the soft
coiled tubing. Any other ideas are welcome!! I am so happy to
have such smart and resourcefull people to contact for advice! I
learn so much from you all every day. Thanks-Carrie Nunes
@tnunes