Em202/B conference medium back chair structure is made of pressure diecast aluminium and transversal elements united in order to sustain and to keep stretched the elasticized mesh that form the seat. Polished aluminium finishes. Armrests in pressure die - cast aluminium and upholstered in real leather. Seat and backrest are made up of a single frame with elasticized mesh fixed to the aluminium structure. Knee-tilt mechanism with polished finish casing that can be locked in 4 positions. Back resistance adjust- ment according to user weight with side telescopic lever and antishock locking/unlocking device 5-spoke base in pressure die-cast aluminium standard dual -tread self - locking swivel castors ø 65 mm.