--- https://aerocool.io/product/duke/ Model Name DUKE Weight Capacity <150kg Recommended weight <125kg Foam Type High density foam Frame Type Steel Adjustable Armrests Yes, two-dimensional Adjustable Backrest Yes Mechanism Type Butterfly Mechanism Rocking Mechanism Yes, 3° – 18° Gas Lift Class & Height Class 4 & Max. 100mm Base size & type 350mm nylon base Caster size & material 60mm nylon caster Cover material AeroSuede, Leatherette Overall dimension (W x D x H) 69 x 70 x 125-135cm Backrest dimension (W x H) 56 x 83cm Seat dimension (W x D x H) 56x 56 x 47-57cm Armrests dimension (W x H) 69 x 61-78cm Product weight 18.9kg