TOUGH Made from recycled aircraft tires WIDER than the competition so they will last longer SAFE Will not cause ricochets Mounting hardware available separately (not included)Sold individually select length and thickness below
shootingtargets7.com
I have found them to be a good company to deal with.
I'll add that I have some from here and some from Shooting Targets 7 and the ones from ST 7 are good and quite a bit less cost but the ones from Shootsteel are 2 to 3X thicker and nicely cut. At least they were last time I ordered them. Either should work fine but I'd say the Shoot Steel should be more durable over the long run.
The 10" gong I got for 50% off at Cabela's a couple of years ago uses chain, w/ hooks.
I retrofitted the gong itself with beefiest screw eyes (and nuts) I could find at Owe's,
with the eyes themselves sticking out the back.
This cants the gong downwards, so that ricochets angle into the range floor.
That made our Chief Range Officer very happy.