Blank cartridges coming with white fiber can be filled with a liquid of your choice.
You may refill a blank cartridge as many times as you wish.

Matte black empty cartridges for Joye510 Yeti, Titan, TEC and Dura e-cigarette.
Make cartridges with your favorite e-juice!

This product also fits Joye510, Joye-ego, Super510 and Super-ego.

Including 
-50pc Matte black empty cartridges ( Flat Tip ) for 510 and Ego seriece e-cigarette          

one cartridge can be filled in about 0.6ml e-juice, which can support about 100 mouthfuls.
Please do check the pictures to comfirm if they fit your e-cigarette.

Package   
Simple packing without any box