[click to view our shipping policies] Description for Part Number 6249 Colored Thermochromic Banger Thermochromic quartz bangers are hot across the nation! This is due to the built-in temperature-changing crystals, which essentially replace the need for a dab thermometer. Once you identify the color of the sand that matches the heat-up temperature you're looking for, you'll have an automatic temperature indicator! The color-changing crystals around the thermal chamber shift color from light to dark as the banger temperature heats up. When the color shifts from room temperature to a deeper, darker color, you know your quartz banger is getting heated up and is almost ready for action. This dab tech gives you a handy visual to gauge your favorite temperature zone. 100% Pure Quartz Glass Color Changing Quartz Crystals (Sand) Each Color Darkens When Heated Up 14mm Male Only