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Metal Frame – Monel
Metal Frame – Titanium
Metal Frame – Stainless Steel
Metal Frame – Memory Metal (e.g., Flexon)
How to tell the difference between Metal frames
Plastic Frames – Cellulose Acetate (Zyl)
Plastic Frames – Propionate
Plastic Frame – TR-90 / Nylon-Based Plastics
Plastic Frame – Injection-Molded Plastics
How to tell the difference between Plastic frames
Combination Frames – (Metal + Plastic)
Quiz