Inside out, color changing, feather raked, borosilicate glass hot pipe

Inside out, color changing, feather raked, borosilicate glass pipe. Purple lines feather raked on the outside of the pipe. Gold and silver fumed for color change with color changing lines throughout the inside of the pipe. Very thick glass with a flat spot on the bottom. Just over 4 inches long. Weighs 109 grams. Pictures were taken in the sun so the hot pipe is darker in color in indoor lighting.