Cirkul users, this 2-pack of blue cartridge holders is exactly what you need to organize your flavor cartridges! Made from sturdy ABS plastic that holds up well and keeps your cartridges from rolling around or getting lost. Each holder has a 3cm diameter hole that fits most Cirkul cartridge sizes perfectly. The compact size (about 7 x 2.4 x 1.6 inches) means you can keep it on your counter, in a drawer, or even toss it in your bag without taking up much space. Comes as a 2-pack, so you can keep one at home and one at work, or share with family members. The stand design keeps your cartridges upright and organized so you can easily see which flavors you have available. No more digging through drawers to find your favorite flavor! While not officially affiliated with Cirkul, these holders work perfectly with their cartridges. Bonus - they also work great as test tube stands for science projects or crafts. Seriously, if you have more than a couple Cirkul flavors, these organizers are total game-changers!