I've had these cacti for about 2 maybe three years.. I haven't a clue what they are.. I started them from seed in one of those mixture packets.. anywho I replanted them about 4 months ago and they have taken off!! they get plenty of sunlight, mostly outside 24/7 unless heavy rainfall. and plenty (but not too much water..
My question:
Can I cut the top half off and replant it? I know cacti are tolerant things but I have no idea if this is even possible.
Thanks!!

Fyi (if this helps with identifying the type) this cacti doesn't have spikes/thorns.. more like hair