Note: We noticed a customer report that the piston was broken at the beginning of use. We are very sorry for the occurrence of such a problem. Once such a problem occurs, whether it is the initial installation or long-term use, please contact us by email or Amazon, and we will arrange the replacement for you immediately. Why should you choose this saddle stool? First, Saddle seat design for comfort on the back and spine, to increase comfort and productivity. Our saddle chair is made from 100% molded foam, very comfortable and elastic, not deformed.It can bring you good support and long-term comfort, you can use it about 8 hours a day. Second, With advanced technology, the massage stool on the back is smooth and round. This does not change anything to some products, which makes it live longer. Finally, Adjustable height: from 54 to 74 cm, higher than ordinary saddles, more suitable for a variety of scenarios. At the same time, the wheels adopt high-quality PU wheels, which are very smooth and do not scratch the floor. Suitable for kitchen, living room, office, clinic, living room, etc. Warranty service: 1 year. Weight capacity: 150 kg