The strength of THCA pre rolls depends on several factors, first and foremost the THCA percentage of cannabis flower used and the strain. Good quality THCA pre rolls like from Killa Kush tend to have high THCA percentages, which means there is high potential for THC conversion when combusted. Some will even have concentrates like kief or diamonds infused in for an extra kick. Look for clear labeling and lab results to seek out the strongest ones.