Top of the line cartridge from Heavy Hitters. Competition grade " Peoples Choice Winner". Contaminant FREE. Standard 510 thread, 4 volt maximum cartridge. Pure wax cartridge. ALL cartridges test ~90%THC Fast and Friendly offers 24hr 100% replacement for any factory defects, Replacement is for product to same product received. NO cash back, NO instant credit. Fast and Friendly does NOT replace EMPTY oil cartridges or cartridges that have malfunctioned due to patient error/mistreatment.