Spectrum Papyros Kiln Shelf Paper 20 1/2" Square - Money Saving Economy Multipack 3 Sheets Economical 3 Sheet Pack. Sheet measures 20-1/2" x 20-1/2 Sturdy, ceramic-based paper is specially formulated for glass fusing and can be used for multiple firings Provides excellent glass/kiln shelf separation at temperatures up to 1600F Retains its paper-like qualities after firing making clean-up easier