These eye glass strap holders are great.I always have trouble with my glasses slipping off when I am busy working,and once I put these grips on my glasses not once did they fall off.The grips are very easy to slide onto my glasses.They were very comfortable and secure,they did not cause any irritaion to my skin(ears).The pack came with 10 sets of grips.I was very happy about that.They were in clear and black colors.My glasses are black and I loved that you could not even tell I had the grips on when I had my hair up in a pony tail.I will use the clear ones when I wear my hair down.I am very happy with these grips and I would recommend them to anyone who wears glasses of any sort.