K & S PRECISION METALS 8143 5/8x12 RND BRS Tube 5/8 inch diameter x 12 inch length Round shaped hollow tube easy to cut and solder For hobbies and model building Each size telescopes into the next corresponding size Hobby/Craft Home Improvement/DIY Electrical Engineering Education Static Models Puppetry Prototyping <span class="a-text-italic">and more!</span>