Superior 40" Greystone Stacked Ceramic Liner Kit for DRT2040, DRT3040 and DRT3540 Gas FireplacesWhat's Included 3 Piece Firebox Liner Kits Features Made of durable ceramic Lines the interior of your unit Adds a stacked brick appearance to your fireplace Other finishes available Specifications Model Number FLK40GREY Catalog Number F3958 Finish Greystone Stacked Ceramic Size 40" Compatible Fireplace DRT2040 DRT3040 DRT3540 Other Finishes Available Blackstone Stacked Ceramic Blended Brown Stacked Ceramic Black Reflective Porcelain