When looking for a cartridge for wax pen, there are several factors to consider, including cartridge compatibility, the type and quality of the heating element, the type of concentrate used, and the maintenance and cleaning of the cartridge. Here are some suggestions and product recommendations:

Compatibility: Make sure the cartridge for wax pen you choose is compatible with your device. Some cartridge for wax pen may have a 510 thread design, which means they are compatible with many standard crayon batteries.

Heating element: The cartridge for wax pen's heating element, such as ceramic, quartz, or wire, affects how the wax is heated, which in turn affects the flavor and purity of the steam.

Maintenance of cartridges: Clean the cartridges regularly, especially the connection points, to ensure good performance. Some cartridge for wax pen are disposable and should be replaced after use.

Product Recommendation:

Utillian 5 Wax Pen: With a 1500mAh high-capacity battery, 4 heating Settings, 1 Cantel coil and 1 twisted titanium coil, USB charging port, this crayon pen is perfect for handling large amounts of extracts and producing a lot of steam.
Yocan Evolve Battery: This battery from the Yocan brand is suitable for crayons and has a 510 thread design suitable for the use of strong crayon concentrate.
Dip Devices Dipstick Dipper Wax Vaporizer Pen: This crayon offers an innovative combination of a traditional crayon pen and honeydew collector with three different temperature Settings, a 900mAh battery, and a micro-USB charger.
When selecting cartridges, you should also consider the capacity of the cartridges, which will affect how much concentrate can be loaded per fill. Some cartridges may have a smaller capacity and are suitable for quick use, while others may have a larger capacity and are suitable for extended use.

Finally, remember to check whether the cartridge for wax pen is suitable for your usage habits and needs, and whether it can provide the steam experience you want.