The Mission XV Mission Tip sets are integrated Billet Box drip tip sets that come with several sleeves to limit airflow. They come in various different styles with 2 colors to choose from, black and white. The nubs themselves are interchangeable with the integrated stems and are made of Teflon.
The different styles available are:
Flute (black or white)
Rocket (black or white)
Volcano (black or white)
Quantum (black or white)
In addition to the styles and materials offered by Mission XV, Never Normal also offers sleeves for the Mission tip system.
These were available in drops in the Mission XV Facebook group and on their website, but they were in limited supply and there is no word if there will be any more made.