--- https://thunderx3.com/product/yama1/ Maximum weight <150kg Recommended weight <125kg Frame type Nylon Adjustable armrests Yes, one-directional Adjustable backrest Yes, 90° – 135° Mechanism type Multiblock mechanism Rocking mechanism lock Yes. Gas lift class & height BIFMA tested level 4, max. 100mm Base size & type 350mm nylon base Caster size & material 60mm nylon caster Cover material High tensile mesh with leatherette Overall dimension (W x D x H) 66 x 70 x 118-128cm Backrest dimension (W x H) 48 x 74cm Seat dimension (W x D x H) 50 x 50 x 46-56cm Armrests dimension (W x H) 66 x 63-80cm Product weight 15.5kg