9mm (.354") brown Delrin nylon, 27-3/8" long. Polished brass tips are threaded 10-32 at rear, 8-32 at front. Made in the USA, by Track of the Wolf, Elk River, Minnesota.
No ramrod is unbreakable, but with normal use, this rod should last a lifetime. Use a ball starter to engrave the rifling at the muzzle, and wipe the bore after every shot.