I probably have four or five, but my favorite is a teeny little blue one about 2 and a half inches long, which lost it's cap years ago. Have no idea what brand it is and if I lose it, which is very often, I go nuts looking everywhere for it. It is sneaky and does it's best to hide from me. Often, it crawls under the front of my machine and cowers there, making itself as small as possible. Wouldn't you think it would be proud to be my prize possesion?