These are brass-plated steel d-rings made to fit on 1-inch straps.  They are open-eyed, which means they aren’t welded shut, so if you apply a lot of side-to-side pressure on these in your bungee-jumping harness you’ll be meeting the pavement up close and personal.  The metal is about 1/8″ in diameter, which is pretty heavy duty, so it takes quite a bit of pressure to open these up.  In other words, they’re very good quality d-rings.  USA shipping is free for any quantity of these.