... They may be pulleys, sheaves,rope sheave,or idler wheel plastic idler pulley Used for Windows, Door, Transportation ... Mechanical Device, Trolly, Toy, Trunk, Elevatorplastic idler pulley Features and Benefits :Self lubricatingHigh tensile strengthCorrosion and chemical ... absorptionVery low frictionTypes:Single wheel pulleyDouble wheel pulley /complex 2-side movable pulleysSwivel eye pulleyV- ...