Leisure Shiatsu Massage Chair three features for the back cushion massage assembly ; 1.Guide mechanism makea the rolling wheel to travel up and down closely to the two sides of the back vertebra 2.Automatic position-changeable rolling wheel can make the rolling wheel massage in inward or outward and negative direction 3.All mechanism can make the kneading ,pushing and knocking etc. massage by the microcomputer programming. With CE approved 20 feet container: 48pcs Delivery time: 25days we have the best price for the best quality.