M1 Series: The M series is home to all of our metal frames. Metal continues to be the desired frame material when trying to achieve the classic look. We’ve put our own spin onto these classic metal frames to give you a unique and sleek edge. The rims are made of stainless steel with a nickel-free plating to give it a shiny matte effect without turning you green. Acetate temples are then attached to these metal rims by hand to complete the classic piece.