Mid to high grade. Tyrannosaurus glasses are a mid-to-high-end brand with good quality. They are made of imported super-elastic thin steel and precision laser cutting. The thickness is only 0.6 mm, making them thinner and more elastic. 0.6 mm thin elastic steel is micro-carved into hollow lace, and patented technology is used to integrate color-blocked TR temples, which are seamlessly connected with metal grooves of the same color. Founded in 2003, Tyrannosaurus glasses are an eyewear brand under the French Essilor Group.