Chair MP-309:
Overall Dimensions: 26.8''L*30.75''W*47''-52.7''H
The Width Between the Two Armrests: 30.7''
Pedal Dimensions:13.4''L*7.8''W
The Seat Cushion Widt: 23.3''
Maximum Load Capacity: 400LBS
Recling Angle: 90°~115°-135°
Cushion Thickness: 5.5''

Chair MP-310:
Overall Dimensions: 24.4''L*31.5''W*42.2''-51.2''H
The Width Between the Two Armrests: 31.5''
The Seat Cushion Widt: 23.6''
Maximum Load Capacity: 500LBS
Cushion Thickness: 5.12''
5D Adjustable Armrests
Bulit-in the airbag to inflate the lumbar area of the chair

Note: All sizes are taken manually and may vary by 1–3 inches.