This space-saving 20.5in. wide Craft Roll comes packaged in a handy dispensing box. PAPYROS Kiln Shelf Paper is a ceramic-based paper specially formulated for glass fusing. When placed between the kiln shelf and the underside of a glass project, PAPYROS prevents the glass from sticking to the shelf during firing. Because of its sturdy composition, PAPYROS provides excellent glass/kiln shelf separation on the first use, and frequently even in subsequent firings.