Rasmussen DF-AFS30 Alterna Vent-Free Double-Face FireStones - 20 PiecesIMPORTANT: All Rasmussen products are considered final sale. Once an order is placed, it cannot be canceled or returned. Please double check your order before completing the purchase. Description "Natural" is the tannish gray of the base material. The other colors are our proprietary ceramic stain coloration. We recommend darker colors (Black, Dark Gray, & Brown) as the burner will create soot from the natural, luminous yellow flame. The black soot is