i don't know what strain they are, but i have some amazing booms right now. they are mostly pretty small, but pack a awful big punch. i took 1.5 grms on the 4th and tripped my face off. in and out of conciousness, hilarious noises (cartoon sound effect noises), distorted everything, and a little more appriciation for the human brain the next day. i have about 10 grms left for a camping trip in august. 4 of us each getting 2.5, this is going to be fun!