Dear Customer, thank you for your comments. Mixed material frame eyeglasses combine the merits of metal and acetate, achieving the durability, lightweight and comfort. If you prefer, Memory Metal is a type of lightweight and ductile metal, which is not easily broken. Or TR is also a type of lightweight and flexible plastic, which is not easily broken. You may also check this link for frame materials for reference: https://www.firmoo.com/help-p-144.shtml. Also, the lifespan of eyeglasses not only depends on the quality of materials but also maintenance. By the way, there are several helpful tips for glasses maintenance. Please click here to see the details. Please don't worry, we have friendly after-sale policies. Allow us to further check on this and our CSR will reach out to you via email (within 24 hours during weekdays and 48 hours when weekends). Please check your inbox or spam mail. Stay safe and healthy! Thank you!