Pupil's chair Optima adjustable 3-5 group, brand Omega

Stools series "Optima" are made in accordance with the requirements of GOST 22046, GOST 11016.
They are recommended for equipping classrooms as for senior classes, with the growth of students from 165 cm. to 190 cm. and above, and for junior classes from 135 cm. to 165 cm.
The product is based on a sturdy frame made of 40x20x1.5 and 45x25x1.5 flat-oval steel pipes.
The rigidity of the frame is provided by three horizontal lintels made of pipes with cross-section: 30x20x1,5, 20x20x1,5, located under the seat and 40x20x1,5 flat-oval section between the supports.
The frame is painted with polyester powder paint.
Seat height adjustment is telescopic, with a step of 40 mm.
Height adjustment of the backrest above the seat: telescopic, in 20 mm increments.
Backrest and seat are made of 9 mm thick birch plywood.
Seat with a squeeze and bend in the front edge. The backrest is radiused with a lumbar bend in the lower part. Fastened to the frame with extractor rivets.