Field Testing Full Aperture Trial Lens Set (38mm lenses in metel rims) supplied in an attractive wooden case. The following lenses are included: Spheres: -20.00, -16.00, -10.00, -8.00, -6.00, -5.00, -4.00, -3.00, -2.00, -1.50, -1.00, -0.50, -0.25, +0.25, +0.50, +1.00, +1.50, +2.00, +2.50, +3.00, +3.50, +4.00, +5.00, +6.00, +7.00, +8.00, +10.00, +16.00 amd +20.00D. Cylinders: -6.00, -5.00, -4.00, -3.00, -2.50, -2.00, -1.50, -1.00, -0.50, +0.50, +1.00, +1.50, +2.00, +2.50, +3.00, +4.00, +5.00 and 6.00D.