Sert sandalye (SERTTONET) is a firm established by Mumtaz SERT in Bolu in 1948. Today the firm is driven by his grandson Mustafa SERT who administers a staff of 30 employees, a closed working area of 1000 m2 and a product capacity of 10 thousand per month.

Sert Thonet makes a special effort in following the latest trends and keeping the quality higher than the price. With its corporate structure, the firm has made significant progress towards integrating its facilities and continues to invest in this. The firm has managed to be one of the leading vendor firms in Turkey in the field of producing papel chairs, monoblock chairs, metal chairs and tables.

Sert Thonet is the first firm in Turkey that started the production of thonet chairs, thonet coat racks, thonet rocking chairs and tables and has kept the production going since 1948.