Senlyde Dali Non-Slip Stainless Steel Bowl Set Double-walled Insulated, 18oz Set of 5 Silver

Which country this bowls are made of

Can they be used in a pressure cooker or InstaPot? Or will the double walls be a problem under pressure?

Is the edge of the bowl sharp?

Can these bowls be put in oven to keep food warm? I will be making several different curries to serve, making one at a time, will need to keep warm an