Preferred Gardens x Friendly COLLAB Cured Resin Cartridge. Friendly Brand cured resin cartridges are crafted from cured cannabis flower grown by industry leading cultivators from California. We NEVER filter or use additives in our oil because we believe in the most natural representation of each strain’s unique flavors and effects. That’s the Tru Spectrum™ difference. -- Connect to any 510 thread battery heated at no more than 3v to enjoy without burning the oil. We invite you to experience why Friendly Brand is the favorite of cannabis connoisseurs across California.