These are glasses from the JINS IPPITSU series. They are the Hexago (hexagon) model in gray. Although JINS' color designation is gray, the actual appearance is black. I was using these until recently. There are no problems with the operation of each part. They have not been subjected to any severe impacts such as being dropped. They have not been stepped on or sat on. I have many glasses and am selling these to organize my collection. The model number and size are as follows (copied from the JINS official website): Product Name: JINS IPPITSU Model Number: MTF-23S-185AB Size: 92 51□18-150◯40 Weight: 13g Style: Polygon Series: DESIGN Gender: MEN Nose Pads: Cringes type Frame Material: Front: Titanium Temples: Titanium alloy β-titanium I apologize, but I cannot accommodate price negotiations. If you have any questions, please feel free to comment. Thank you very much. - Color: Black - Frame Material: Titanium, Titanium alloy (β-titanium) - Lens Shape: Square (Hexagon) Thank you for looking.