I'm using this copper rod for exercise and it's 20 mm X 500 mm, and weighs about 1,416 grams. Holding it out from one handle at full extension is a good excercize and strengthens my wrist for using my nunchucks and I don't know anyone with a nice piece of copper. I can always turn it into low resistance battery terminals. The price was higher due to the US tariffs making a mess of the predictability of world trade but worth the short wait even with customs slowing it down. The junkies will drool