This is one steel hoop removed from a Yamaha 12-inch tom, likely from the late 1960s to early 1970s. It has 6 tension rods and measures approximately 1.6mm thick. It has been cleaned and is quite clean, but there are rust spots and dullness that couldn't be completely removed, as shown in the photos. It appears to have little to no warping. Please understand that this is an old item and purchase it with no returns or exchanges. For those looking for vintage drum parts, how about this? *Shipping may be changed to Yu-Yu Mercari delivery.