MOQ: 50 sets
Supply Capacity: 8000 sets per month
Delivery Time: 7-30 days depends on the order quantity.
The U-400 ergonomic office chair combines supportive comfort with a plug-in lumbar massage function, ideal for users with lower back discomfort or massage needs.
Upgraded from the U-300 with improved lumbar adjustment and armrests, it offers a balanced elastic-supportive sitting feel, with optional seat ventilation for home office, casual gaming, and relaxation.
Available in black and grey, suitable for users 155–190 cm tall and 45–90 kg.
Product Specifications
| Product-model | MU-400 |
| Warranty | 1 years |
| Optional Accessories | Soft Padding Footrest |
| Chair Frame Material | PP+Glass fiber |
| Chair Upholstery Material | Elastomer Mesh |
| Color | Black/Grey, or Customizable |
| GW | GW：22.5kg/1pc/ctn |
| Packag box | LWH：73*42*65cm |
| Loading-quantity/40HQ | 425 ctn (with detachable base) |
| Packaging Standards | ISTA 1A. 300 lb burst strength |
| HS code | 9401719000 |
Here are four configuration schemes that are currently selling well and have already been adopted by office chair private band.
A higher-end mesh version with flexible armrest adjustment and smooth infinite recline locking.
A cost-effective configuration that keeps key ergonomic functions while controlling cost.
A balanced option combining adjustable comfort and strong value
A premium comfort version with enhanced arm support and a softer foam seat.
A 36 cm wide curved 3D headrest with 22 cm height adjustment.
The dual-axis angle control offers flexible head and neck support for users of different heights and sitting postures.
The high-elastic mesh back uses a zoned design with an X-shaped reinforced frame. The backrest and lumbar support adjust together in 4 height positions, offering 6 cm adjustment for better body fit.
The curved mesh lumbar support includes a plug-in massage module with frequency adjustment, forward/reverse rotation, and heating function.
A 2 m Type-C cable avoids battery-related shipping costs, while a rotating lever adjusts lumbar horizontal depth by 2 cm.
The armrests use a nylon support base with a nylon plastic body and wide soft PU arm pads for better comfort. The armrest frame can fold backward by 90°, allowing the chair to achieve an armless look for easier storage.
Multiple armrest options are available:
Verssion 1—5D foldable armrest: Multi-position height adjustment up to 6cm in 9 levels. The arm pad moves forward and backward, rotates 360°. No electroplated decoration.
Verssion 2—5D foldable armrest: Includes all functions of Version 1, with added electroplated decorative trim for a more refined appearance.
A 52cm-wide seat shell designed to better accommodate larger users .
Mesh seat version, features a sliding funcution for seat depth adjustment(5cm) . It can also be fitted with an optional ventilation fan underneath for enhanced breathability.
Foam seat version does not include seat sliding, but features 8cm-thick high-density molded foam, wrapped in a 3D mesh polyester fabric for a comfortable and durable finish.
Choose between a standard 3-position center tilt with up to 135° recline and tension adjustment, or an upgraded infinite tilt lock mechanism with flexible locking from 90° to 145°.
Equipped with a TUV-certified Class 4 gas lift, offering reliable strength and smooth height adjustment with a default 100 mm stroke and a 4 cm sinking height.
The L-shaped base measures 350mm and is designed to be removable, helping save packaging space during shipping.
A decorative cap is included to neatly cover the welded connection area, improving the overall finish and visual appeal.
The soft upholstered footrest uses a double-tube sliding structure and can be pulled out and flipped open when needed
50mm dual-wheel design. The soft PU silent casters reduce rolling noise and help protect the floor.
Available in black or grey to match the chair color scheme.
It offers good flexibility and firm support.
Two texture options are available: diamond pattern and decorative dragon pattern. Color options include black and grey.
The backrest frame, seat frame, and other plastic parts use PP with 20% glass fiber. This material improves strength and durability.
The foam seat uses high-resilience molded foam with a density of 45–50 kg/m³. It keeps its shape after long sitting.
The seat cover uses 3D mesh polyester fabric. It is breathable, stain-resistant, and easy to maintain.
Too many customization options? Reach out now and we’ll help you find the right chair part solutions.
