I ordered 3 Kingpen cartridges. What I got was 2 Kingpen cartridges and 1 Stiiizy cartridge. The Kingpen battery it came with didn't even work with the Stiiizy cartridge, so it was useless.
I emailed customer service to ask for a refund. They convinced me to take a Kingpen cartridge and said I can keep the Stiiizy. Took a week for the third Kingpen cartridge to get to me.
Im only writing this because I'm stoned and quite happy about this website. Thank you Weedsly.