Eyeglass Frame Grips--Hinge Tighteners (pack of 10)

The rings are small, but letting them sit in hot water and then installing them by holding the stem with the earpiece end extended away from you and coaxing the ring towards you by using your two index fingers (fingernails), saw these rings slide over my thicker stems. An alternative to hot water is to use talcum powder which would assist in the sliding of the rings. For the largest stems, I verified that the glasses in question did not have spring-loaded hinges, and installed the ring from the hinge end by simply removing the stem with a jeweler's screw driver and placing the ring on the hinge. (If you have spring loaded hinges, do not attempt to do this unless you have the know-how, or have viewed the YouTube clips on how to re-attach a spring-loaded stem to the frame.)Because of the one size fits all, you might find that besides the difficulty in sliding the rings over the stem, there might be a situation where the ring when positioned, is not being "pinched" by the stem, when the stem if fully open. You can fine tune these however, by cutting a small, round, eraser tip-size washer out of an old bicycle tube, with a small puncture in the middle. Slide this over the stem to help work with the ring to give you adequate tightening.Because of the many variables from glasses to glasses, one might not need this amount of stem tightening from the O ring. If the rings fit, but they force the stems inward too much, it might make the glasses too tight on your head, or it might put too much stress on the nose bridge. You might try just the bicycle inner tube; again cutting a patch that is appropriate for your stem size, puncture a hole in the middle, and then slide that onto the stem. I used this technique for one pair of sunglasses that had adequate grip (but wanted a little more so as it slips during physical activity). This technique gives just the right amount of grip, while the inner tube is surprisingly inconspicuous. If you need to keep glasses from slipping, try the rings or inner tube, but also do a search under "no slip silicone nose pads." I'm waiting on a ten pack pair of those from Amazon, which hopefully when combined with the inner tube, will prevent slippage when mountain biking.

These things are seriously HUGE. They slide loosely on the arms of my glasses and couldn't possibly stay in the hinge area to tighten up the fit (which is why I purchased them)Easy return...

There are AMAZING!!! I had a previous pair of Ray-Bans that the plastic kept stretching out too, sliding down my face, and wish I knew about these years ago! I've only had these glasses for a couple months, only wear them at nighttime (since I wear my contacts during the day), and had to have these adjusted like 4 times already because the plastic keeps stretching back out. These were so loose they kept sliding down my nose even at the slighted head tilt, but I only needed 1 band on each hinge (pictures attached) and they fit PERFECTLY now! My frames aren't super thick either (the arms are only about 1/2 " wide) and the band slid right up into the hinge! I didn't soak the bands in hot water either, as a previous reviewer recommended, and they still slid right on w/o any issues. Depending how large and loose your frames are, perhaps you'll need more than 1 band on each hinge, but for mine 1 was enough. I'd try wear them for a couple hours with 1 hinge before loading several bands on because they'll stretch out a bit. These are the best thing ever and super reasonably priced! We'll see how many months I can get before having to replace the bands, but either way, for the price and quantity you get it's a much better deal then taking the time out of your day to have your glasses adjusted all the tim. Plus, that can wear our your frames faster (my last pair of Ray-Bans started cracking on 1 hinge because they were being adjusted to many times). Overall, these are incredible and I would 100% recommend! I'll be buying more when I run out.

These are large, will not fit on an eyeglass hinge will only work on the ear piece frame.

These tighteners really do work, but a caveat here. They are extemely hard to get on if you have Rayban's like I do. I have a new pair of Rayban Wayfarer prescription sunglasses. If it weren't for the review of "Brother in Christ" I would have given up and used rubber bands. The secret here is: soak them in hot water first for at least 10 minutes.Don't boil the water, but get it as hot as you can from the faucet and put it in a small bowl and cover it. Wait about 10 minutes and you will be surprised at how malleable they be. I had to coax them over the fat part of the Wayfarer stem, but once I got them past that, they sailed right onto the hinge. When you are placing them, hold the stem away from your body and coax the tightener along the stem. You will need a degree of patience in addition to the hot water, but believe me, if I could them onto the hinge, you can too.Another caveat, you will probably need to put 2 on each side. I had to because the Wayfarer's are a bit loose. But 2 on each side did the trick. The other good thing is that they are hard and not likely to soften and go weak on you any time soon. So far, I've not had any problems with my glasses sliding down my nose. They stay right in place and give me good protection from the sun. I highly recommend them but don't forget the hot water!

These were WAY too big for my glasses, and I can't even imagine a pair of eyeglasses where these wouldn't be too big.