The rings are small, but soak them in hot water and then attach them by holding the earbud with the end of the earbud sticking out from you and pulling the ring toward you with your two index fingers (nails), saw these rings slide over my thicker stems. An alternative to hot water is to use talcum powder, which will make the rings slip. For the largest stems, I made sure the glasses in question didn't have spring-loaded hinges and installed the ring from the end of the hinge, simply removing the stem with a jeweler's screwdriver and placing the ring on the hinge. (If you have spring-loaded hinges, don't attempt this unless you have the know-how or watched YouTube clips on how to reattach the spring bar to the frame.) Because one size fits all. In any case, you may find that, in addition to the difficulty of shifting rings on the stem, there may be a situation when the ring in the installed position is not "snapped" by the stem when the stem is fully open. However, you can fine tune them by cutting a small round washer the size of an eraser tip out of an old bike inner tube with a small hole in the middle. Slide it over the shank to make the ring easier to work with and to ensure proper tightening. Due to the many sleeve-to-sleeve variables, this tightening torque of the stem from the o-ring may not be necessary. If the rings fit but press the temples too tightly, this can result in the glasses being too tight on your head or putting too much strain on the bridge of your nose. You can only try the bicycle inner tube; Again, cut a patch equal to the size of the stem, poke a hole in the center, and then place it on the stem. I used this technique on a pair of sunglasses that had enough grip (but wanted more as it slipped off during activity). This technique provides the right support while the inner chamber is surprisingly discreet. If you need to keep your glasses non-slip, try rings or a tube and search "non-slip silicone nose pads." I'm looking forward to a couple of Revain packs of 10 which, when paired with a tube, will hopefully prevent slippage when mountain biking.
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