Vape Bands - Pack of 20 Vape Rings made with Silicone for RBA RDA Tank Mechanical Mods Vape Ring Bands Serve as a Bumper for Your Tanks and Can Save Your Mod from Minor Scratches Vape Rubber Bands Gives Extra Grip When Holding Your Mod, Especially in Wet Conditions Vape Bands Are Made of Hypoallergenic, Non-Conductive, Non-Porous, Premium Quality Silicone Vape Mod Rings Directly Fit on Your Mechanical Mod or Rebuildable Atomizers Vape Bands SizeInner Diameter 21mm