Tr-90 is also known as plastic titanium, it is not titanium alloy, but Switzerland EMS-Grivory (Ames Chemical) company Cheap Frames Online invented a polymer nylon material, its density is only 1.14 to 1.15 grams/cubic centimeter, only a quarter of pure titanium, stainless steel 1/8, can float in a high concentration of salt water, wear resistance to impact resistance to high temperature, It is also very good in toughness and automatically recovers after large bending. It Cat Eye Glasses Frames is non-toxic. It is a food-grade material in Europe, and it is the most widely used Tortoise Shell Frames material at present. But the TR-90 Tortoiseshell Glasses Frames is less strong than titanium, so it will be thicker than the alloy, resulting in an overall mass similar to titanium.
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