Spare parts
I got a Sihoo chair from a friend, the plastic holders on the backrest were broken. I was sorry to throw the chair away. So I contacted customer service to see if they would sell me new backrest holders. They called me back immediately and asked me to send them photos of the broken holders. After making arrangements, they sent me a whole new backrest for free. I simply replaced the new backrest and the chair continues to work great. Petr K.