KVAP by Zevape Group , is the Extracts Vape Hardware Devices Brand at Shenzhen of China,and Focused on Manufacturing empty Vape cartridges,All in One Vape Pens and 510 Thread Batteries Since 2015. We are the best Quality Vape Cartridges Manufacturer in China.Quality is always our company firstly thing to do, We Only do high quality Cartridges from the Process of Materials/Material QCProduction and production Testing,Packing....