These vape cartridge silicone dust protectors are placed over the tops of the mouthpieces to keep dust and debris out of the cartridge tip area until it arrives to its final destination, the end user.
This is a new product that we just started to carry due to the recent demand. Priced as low as 2 cents each when you purchase 10,000 units at a time.
NOTE: These fit flat tip style vape cartridges like the C-CELL style and other flat tip style mouthpieces. They can work with round tips, but they won't sit perfectly flush like they would with a flat tip.