i made this to go on both the visors in my family car, since theres 6 of us all packing indriving to drive to arizona (best vacation ive had i think), its alot of grams because  its strong lol, the glasses always fit nice and snug, and they would like clip in, didnt even rattle after days of driving, and 2 weeks later driving back, id say they work like a charm ;)