The Petrof P 131 E1 is ranked in highest, master built upright piano series. These are upright pianos with the greatest sound potential that are therefore favourites of demanding professional pianists. They are suited not only to apartment interiors and music schools, but also presentation piano recitals within an orchestra or in different public stages.

The E1 model has a non-traditional music stand, which allows the score to be placed within a wider area and at the height of the pianists eye.