They are the 16mm fioronis. They have worked well for me. I used 35 fr 30 rr losi oils, vented felt the best. Next I'm am trying 6x1.4, I took the tekno 8x1.4 and plugged two holes. I think they will be more consistent thru a run as I have felt recently the fioronis seem to feel softer later in a run, and I think it's due to the oring creating a slight bit of friction against the shock body heating up the oil making it feel like a lesser weight, making it feel like the piston is blowing thru the stroke......just my thought on it. I still run the fioronis on my truggys tho because I think with such a large stroke it goes unnoticed