MAD's famous Super Crystal pot call utilizes a perfectly constructed poly-carbonate pot with a crystal striking surface to bring in the Toms. A Purple Heart striker brings very realistic yelps, cutts, clucks, and purrs while the Rainy Day carbon striker produces those very high pitched vocalizations for winding days or long range calling. Strategically placed sound ports in the bottom of the pot provide optimum sound quality. Exceeds 15,000 Hz. Pot diameter: 3-7/8".