The bowls are very thin and lightweight. the bottoms are not flat, but slightly convex so that the bowls wobble. only on my small bowl, i was able to press the bottom inward so that it became concave and would sit flat. the other bottoms pop back out after pressing in. perhaps a more forcefull approach could work. the ml markings on the bowls are wrong as shown in my pictures. the 500 ml level on the largest bowl actually holds 1300 ml, and the capacity at the top 2000 ml line is actually 2375 ml. the capacities of the other bowls are 1230 ml and 880 ml at the top lines. they would all hold a little more if you fill them to the brim. they exact materials are not defined. the support agent said it might be 201 or 304 grade ss and titanium nitride pvd coating.
