I've been thinking about making some small stepping stones. Is this concrete rather than hypertufa? Is is strong enough for actual stepping?

It is concrete but not sure if its strong enough to step on although it does look quite strong. I didn't put any reinforcement in it which i will do next time, then i'll be sure its strong enough.

I make my stepping stones from tufa, I prefer the sandstone look. Maybe 6-8 cm tick, some are 60 cm X 40 cm. I put chicken wire inside. We use the stones in the garden for years. You just have to wait until it cured, 6-8 weeks. We don't have hard winter, -5 C , I never lost any of my tufa projects. My mix is 1 portland : 2 sand : 1 peat moss. I cast the stones in big, flat cardboxes , put plastic inside. One layer of tufa, chicken wire, tufa again.