Have a microwave kiln, but hate cutting thinfire to fit? Want to use shelf paper of some kind, but don't want to order huge amounts? Buy 3" rounds! These rounds have been die cut to be exactly 3" around, making them a good fit for most microwave kilns. They're made of genuine bullseye ThinFire, punched off the roll, no substutions or questionable alternatives. This is a perfect way to demo ThinFire without investing in a lot, if you're unsure you'll like it. And, if you do, but don't want the hassle, you can stock up on a lot of rounds economically! Please note: ThinFire is only good for 1 firing, then it turns to dust and needs removed. You will need a fresh piece of ThinFire or shelf primer each time. Please wear a mask and dispose of ThinFire carefully. Do not inhale.