Made of sturdy steel. the Japanese-designed Fireplace Coal Bed M turns the Pack & Carry M Fireplace into a charcoal grill. The Coal Bed elevates coals. briquettes or wood for an even heat source when cooking. To use. insert the Coal Bed into the Pack & Carry Fireplace and place coals or briquettes on top. Pair the Fireplace Coal Bed M with the Pack & Carry M Fireplace.