This .NET class wraps the AcGeOffsetSurface ObjectARX class. It represents an offset object.

Autodesk.AutoCAD.Geometry.Entity3d
    Autodesk.AutoCAD.Geometry.Surface
        Autodesk.AutoCAD.Geometry.OffsetSurface

Public sealed Class OffsetSurface
Inherits Surface

public sealed class OffsetSurface : Surface;