- Insert Thrust ball bearing; - "Inner stop" technology; - Meet GS standards; - Applying Damping ring - Sleeve designed Works the part of a personShoulers and elbowService sitesLuxury Villas Garden, City park, Seaside retreat, Scenic spot, Amusement park, playground, recreation ground, residential park, uptown park, leisure place, community center, activity center, hospital square, school, ...