Titanium:

1. Material-exceptionally lightweight and durable metal material.
2. Comfort-They are corrosion-resistant and hypoallergenic, making them an excellent choice for those with metal allergies.
3. Durability- Titanium frames can be thin and elegant while still providing strength.
4. Monel: nickel-copper alloy commonly. Monel frames are corrosion-resistant and durable, but they may contain nickel, which can be a concern for individuals with nickel allergies.
5. Aluminum: Aluminum frames are lightweight and corrosion-resistant. They are often chosen for their modern and sporty designs. However, aluminum frames may be less durable than some other metal options.
6. Flexon (Memory Metal): Flexon is a brand of memory metal, which is a titanium-based alloy that has the unique ability to return to its original shape even after being bent or twisted. Flexon frames are known for their flexibility and resilience.

Here are some general characteristics and considerations for metal optical frames:

• Durability: Metal frames are generally durable and can withstand daily wear and tear.
• Adjustability: Metal frames can often be adjusted for a better fit by an optician, allowing for customization to an individual's face shape.
• Style Options: Metal frames come in a variety of styles, ranging from thin and minimalist to bold and decorative. They are suitable for both classic and modern looks.
• Hypoallergenic Options: Stainless steel and titanium frames are often chosen for their hypoallergenic properties, making them suitable for those with metal sensitivities.
• Weight: While metal frames are generally lightweight, the specific weight can vary depending on the type of metal used.