3Pcs Ceramic Wool Sponge for Bioethanol Fireplace Firebox Safety Leakproof Combustion Ethanol Tabletop Smokeless Fires Made of high-density ceramic fiber with a high melting temperature, this firebox is designed for use in fireplaces, fireplace ovens, and gel burners. It supports a steady, attractive flame even at low fuel levels and helps extend the life of your fireplace. Improved safety performance: The material composition helps increase burn time and reduces the risk of flare-ups. It also helps contain flames in the event the unit is accidentally tipped over. Provides a sealed combustion chamber to help prevent leaks and reduce potential hazards. Easy to customize: The fiber material can be trimmed with scissors to fit your specific fireplace or burner. No additional tools or complex steps required. Available in two sizes (30x10x5 cm, 30x10x2.5 cm) and a classic white color, this calcium magnesium silicate fiber blanket is compatible with a variety of ethanol burners and fireplace systems.