BLUSTN BLUE THERM 18X18 IN COR 18" x 18" 2" Bluestone Blue Inside Corner Coping Bullnose Thermal can be very versatile and can be ordered in a variety of widths, thicknesses and surface textures. Typically comes in a blue-gray color but it is also available in a variety of colors that includes more earthy tones. This type of coping comes with a thermal top and bullnose edging.