From the point of view of grammar, both are correct. How would a native speaker express this thought-- depends on context. 1. I'm in a restaurant and expected something better. I complain -- "This plate is made from plastic. It gives an unpleasant flavor to the food. 2. I broke a plate. I was about to throw it into the trash, but I think better of it. "This plate was made from plastic, so I should be able to recycle it rather than throw it in the trash." In general the past tense of "to be" is "was/were" I was at the park. We were at the park. Past perfect: has / had been. "We had been at the theater just last week, and this week we heard that there was a fire." Best Val

Bello, i'm from colombia... Then i thing that in the second one you are using to be in past.