Bullseye ThinFire is a ceramic impregnated shelf paper that provides excellent separation between glass and kiln shelf in firing application up to 1600 degrees. No messier kiln wash sticking to the back of your glass.For the smoothest finish on the bottom of your kiln-fired projects. Sheets are 20.5" square. For smaller applications, simply cut with scissors. ThinFire Shelf Paper is intended for single use. Bullseye logo printed on the backside. Instructions and tips are included. Shipped rolled.