Main ingredients: natural material tortoise shell, wood, horn, ivory, etc.
Features: natural environmental protection, small stimulation to the skin, have health care function, the price is expensive.
The market is relatively rare.
Main material: metal alloy of copper and copper alloy, aluminum alloy, stainless steel, monel alloy, nickel alloy, pure titanium and titanium alloy and pure gold, platinum, etc.
Characteristics: strong and light.
Inferior metal alloy frame can produce stimulation to the skin, different metal material price are different.
Plastic plate main materials: plastic board materials.
Features: plastic frame light weight, not easy to damage, affordable.
More style, is popular with young people.
Memory material main material: contains strong resilience of metal and nonmetal materials.
Features: light quality, super elasticity, big bend.
Suitable for frequent business trips, the job is busy, often people use picking and random glasses.
related: frame frame material