black surface office chair gas lift / gas spring - FY-85D

Operating up and down very smoothly without noise.Dimensions and F1 changeable to comply with buyer's request. This is our black gas spring ,it mainly used on secretary chair,boss chair. All of our gas lift have passed SGS,LGA,TUV Test.We export our gas lift to all over the world. Our gas lift have four kinds,class 1,class 2,class 3 . Operating up and down very smoothly without noise.Comfort and maximized efficiency of the chair. No need of additional fixture for a joint as the single outer pipe with cylinder in solid steel material. Dimensions and F1 changeable to comply with buyer's request. Leading time : 7 days for 10000 pieces , 15days for 30000pcs Guarantee time : two years for class one , three years for class two ,five years for class three. Packing details : usually 10 pieces in one carton , also 400-600 pieces in one wooden ca rton .