Specification: Made of good ESD material & materials that measured up with clean room standard Cushion spec: 410mm*440mm, blue or black leather. Surface resistance: 106ohm~109ohm Molded cushion basic, added highly filtrated, durable PU foam in the middle Handle under the cushion controls the height, air-drive adjustment, comfortable Backrest: normal size is 320mm*400mm, blue or black leather, surface resistance is 106ohm~109ohm, senior filtration facility installed to measure up the clean room criterion Leg: non-oil air leg, three types are available (normal: 440mm~580mm/ heighten: 440mm~850mm, a pedal is needed, pedal diameter is 400mm/ shorten: 230mm~580mm) Foot: molded, chrome plate aluminum five-star foot Wheel: aluminum molded, no pollution to the floor, can be used in the clean room directly. (High intensity, durable, nylon ? foot cup? is also available.) Feature: 1. No pollution, Measure up with the criterion of 100 or above clean room & antistatic industry 2. Safe, comfortable and durable 3. So easy to assemble and disassemble 4. Suitable for ESD protection area or class 100 clean room or under, such as electronics, exactitude instrument, food processing, etc