This week's collaboration with What is it? blog brings us these two strange springs (6" tall). Leave a guess in the comment section (no URL, please - let others play). First correct guess will win a Free Neatorama T-Shirt!

Remember to check out What is it? blog for more guessing fun!

Update 3/1/07: The answer is ...

Springs for making a regular chair into a rocking chair, they mount onto the bottom of the front legs.