The Uwell Crown IV Replacement Glass is a durable quartz bulb glass for the Uwell Crown IV Tank. This replacement glass is made out of quartz glass making it one of the most durable glasses in the game. The Uwell IV Replacement Glass is shaped as a bulb for a unique look and extra e-liquid storage. The Uwell IV Glass is designed to hold up to 6ml of your favorite vape e-liquid. The Uwell Crown IV Replacement Glass is a must have accessory for Crown IV Tank users. Shop this glass and enjoy the extra storage that can last you all day.