Constant Force Spring is used for computers.

Constant Force Spring: Features: Proname Constant force spring Thickness 0.30±0.02mm Width 25mm Length 280±5mm Small Aperture 3±0.15mm Big Bore 3.8±0.15mm Holes from the end 2.5±0.2mm Larger Hole-side distance 8.5±0.2mm Hole spacing 19±0.2mm Large Hole spacing 13.8±0.2mm OD 23.5±mm less Minister of degree line 10mm Hardness Hv600±50 Load 4.65±50 Kg Durable 3500 Times above Decay rate After the 3500 return is less than or equal to 15% attenuation Exterior No injuries,pollution and other color **************************** Amanda Guo Zhuhai Power Spring Inc. Add:No.12 Jinhu Road Jinwan Area Zhuhai P.C.:519040 Tel:+86 0756-763-0555 Fax:+86 0756-763-0909 M.P.:+86 159 1630 4132 http://www.powerspring.cn ****************************