Specification: Made of good ESD material & materials that measured up with clean room standard Cushion spec: normal diameter is 275mm, 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~290mm) Foot: molded, chrome plate aluminum five-star foot Foot cup: High intensity, durable, nylon ? foot cup? (aluminum molded is also available) no pollution to the floor, can be used in the clean room directly 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 electronics, exactitude instrument, food processing, etc