These replacement foam earphone tips are pretty nice. They more or less work as advertised. They are not easy to attach to the headphones, the fit to the hardware is extremely tight. The foam is very smooth and soft. They are fairly short, so they go deep in your ear. The sound isolation is no better or worse than other tips. I heard a little bit of bass improvement, but nothing remarkable. They are a darker dove gray and smoother than the pictures I've seen.
My only complaint with these, they are expensive. According to the instructions, they should be used for around 3 months. A package of three isn't a year of headphone tips, and that's a bit costly.
There's a bit of a downside to these, if you have dirty ears, well the foam will get very dirty. Don't switch ears with these things (left to right); and don't put these in somebody else's ears. All bad hygeine ideas.
I bought these for Sennheiser CX300 headphones. At first it looked like these are the wrong size. The inner plastic tube is a lot longer than the Sennheiser tips. So you have to press them on the headphone pretty hard, they will not fall off in your ear. Make sure seat the tips down close to the speaker body.
The key to making these work, you have to roll them so they are very narrow. Insert them in your ear fairly quickly and deeply. After a few seconds they expand and seal in your ear. They stay put maybe a bit better than the other tips I've tried. Sound isolation will be obvious if they were inserted deeply and quickly enough.
Minor bass improvement. Feel pretty good in my ear. Short. Decent fit and sound isolation. I liked these, but just wish they were less expensive (although attached to over two hundred dollar headphones its minor - some of the other models, maybe not such a good deal). Check compatibility at their website - its critical to get the right model.