3 Colorful Glass Oil Burner Pipes

Three glass pipes, often called oil burners or bubble pipes, stacked on top of each other. Each pipe has a different color. The one on top is a deep blue, with a rounded bowl and a straight stem. The middle pipe is translucent green, and the bottom one is a golden or amber color. All three have a similar simple design with a round bubble-shaped bowl and a long, straight mouthpiece.