WELOYA Vape Rings Silicone Anti Slip Band for RBA RDA Tank Mechanical Mods 20 pcs These Vape Rings are a simple design. The anti slip rubber helps you with those hard to turn mod locks. Directly fit on your mechanical mod or rebuildable atomizers. Also serves as a bumper for your tanks and can save your mod from minor scratches. Gives extra grip when holding your mod as well, especially in wet conditions. Vape Rings Silicone Anti Slip Band for RBA RDA Tank Mechanical Mods Size : inner diameter 21mm ( 0.826 Inch ) Package include: 20 pcs Rubber Silicone Ring Band . We often focus on customer reviews to improve our service. For example: product quality, customer demand, clear pictures, and so on.