Durable Leather SL Type Pulley Guide for Zero Gravity Massage ChairsSpecification Main Color: Black Main Material: PU Details Product Features: Innovatively designing four wheel movement to glide fordward and backward, the fast locking and unlocking device,found a perfect solution for traditional. Breaking the traditional architecture design of the massage chair, the zero gravity state close to the flat lying achieve the angle surpassing, coupled with the The four wheel institution can double way movement, which can