Covert Extracts 100% Cured Resin. 510 thread Cartridge. Covert Cured Resin Cartridges are made with premium cured in house material, sourced from our farms located in the beautiful Applegate valley. All of our extracts are put through a special filtration process to remove naturally occurring lipids and impurities. Our cured resin cartridge is just that, cured resin. Nothing more, nothing less. Uncut and pure, you can expect a terpene rich, strain specific experience enjoyed in our top of the line hardware. We use ceramic tips and glass tubing to ensure that the quality of our product greets you in the best possible way.