Leadman cylinder factory is in Shunde of China, we specialize in gas spring for office chair more than 7 years , we passed BIFMA5.1 and BS5459 test by firm guarantee on perfect integrating of shape, functions and reliability of goods. Our products are accepted by more than 50 countries and area of EURO,USD, Latin America, Africa , Middle East and Taiwan, Hongkong and Etc. if you have many interesting ,welcome you entry our website: . I am sure I can quote you our rock bottom price. we look forward to your cooperation . thanks so much. following the products details : Material: stainless steel tube color: black & chrome Spec: 60-125 / 143 / 170 / 210 / 240 / 270 stroke. Grade: 3 Packing: 20 pcs /ctn or pallet Loading Capacity reference : 20'ft: 22000pcs 40'ft: 45000pcs Delivery time: 20days after get the fax of L/C or T/T bank slip . Payment: C or T/T, 30% Deposit T/T in advance, balance T/T or L/C at sight before delivery. Sincerely Yours cathy