The trial lens case are made out of refined hard plastics for maximum protection. Smooth interiors hold fast the lens in a manner which minimizes possibility of scratch marks on the surface of the lens. Sphere- 25D (every quarter of dioptre up to 4D, every half up to 6, every dioptre to 14 and every 2 dioptre to 25). Cylinder -6D (every quarter of up to 2D, every half up to 6). Prism- up to 10D with additional 15 & 20 prism dioptre. All trail lenses pack in wooden box.