C02 extract vape pen cartridge by Cannatek, Trainwreck is formulated at 73% THC. Train wreck is a very strong sativa, which very cerebral properties. It’s a great strain for depression. Each Cannatek cartridge contains 500mg of C02 cannabis oil. Cannatek only uses 100% C02 cannabis oil with no additives. Each batch is lab tested by Health Canada certified facilities so you can be assured that the percentages are accurate.