Design and construction of RÖSLER and SCHOLZE upright pianos are designed by the Research and development (R and D) center of PETROF company. They are produced according to the technical documentation of the Department of Construction and Technology of PETROF company and the production is supervised by workers of PETROF company.

Rösler 118, Rösler 126, Scholze 118 a Scholze 126 upright pianos are totally identical as for construction and materials used. The Scholze brand is designed mainly for the Chinese market.

Rösler and Scholze upright pianos are produced so as to be accessible to all players (affordable).

Design and construction of WEINBACH upright pianos are designed by the R and D center of PETROF company. They are produced according to the technical documentation of the Department of Contruction and Technology of PETROF company and the production is supervised by workers of PETROF company. The production is finished in PETROF company in the Czech Republic.

Weinbach upright pianos are also accessible to all players.