I will also reply later about all the above, information needs correcting, Juliet oem lenses measure a 8.50-8.75 curvature, but again that curvature only matters to hand cutters, not me. A 7 base turbine lens looks and fits no differently than oem ones for Juliet, Sapphire lenses in the copper frame section for the Mars and the Juliet are both 7 curvature lenses,