The base of the glass is crooked with a diagonal tilt upwards. Now, is this intentional or were they all stacked and bent? It doesn't straighten and if that's the case, the glasses are not very stable in terms of stability

They break and get lost very easily, so be careful. It would get one star, but then I remembered that it's a product that costs 2.5 euros, so understandable. They are plastic but can withstand the weight of freddo espresso, soft drinks, and hot beverages. The diameter is correct so that it can fit everything. However, I lost them in the open-close door, so be careful.

Old, durable, plastic, size 8, fits a large cup. I made a modification and now I have 2 fixed ones on the door (in an old car).

Unacceptable is for old-style cars with narrow upholstery on the doors.
A large coffee cup does not fit low-quality plastic

It is hard plastic. It holds 1/3 of the classic plastic coffee cup, it's a little but it supports well. It has a slight tilt which is an issue in a cup without a lid.