SpinFitCP100 for IEM - L - Patented Silicone Eartips for Replacement, Secure Fit and Supreme Comfort (2 Pairs) (for Nozzle Diameter from 4.5-5mm)

I'm writing the type of review I looked for before making my purchase(s): a comparison between the SpinFit CP100 and the SpinFit CP100 Plus. I tried out both with Sennheiser CX 300S earbuds, which sound decent but hurt my ears no matter which of the manufacturer tips I use. I tried the CP100 Plus first after seeing reviews that said the material was a little softer and "grippier" inside the ear. They were indeed incredibly soft and comfortable to wear, BUT they had a VERY apparent effect on the sound quality. I don't know enough about sound and music to describe exactly what kind of effect, but it sounded noticeably worse compared to the manufacturer's eartips. I probably would have gotten used to it over time, but the medium size was too big for me and they kept falling out of my ears, so I didn't want to continue using them anyway.I remembered seeing something on SpinFit's page about how the original CP100 is recommended over the Plus if you're concerned about sound quality, so I tried these next in a size down and they're perfect. The material feels just as soft as the Plus and is just as comfortable in my ears. I haven't noticed any less "grippiness" at all compared to the Plus - and since they're the right size this time, they stay put without needing constant fiddling. And best of all, there's no effect on the sound quality. Honestly, unless the grade of the material is especially important to you or you specifically need the nozzle adapters that come with the Plus, I can't think of any reason to choose the Plus over the original CP100.Also, some advice for choosing a size: Take whatever tips you already have that best fit your ears off your device and set them on a ruler to measure their diameter, then compare that against SpinFit's measurements - BUT be aware that the material is very soft and flexible, so it may be fine or even better to go up a size in order to get the best seal in your ear canal. For example, my best-fitting manufacturer tips were 10mm, which is comparable to size SS, but S wound up fitting perfectly.

First, don't look at the negative reviews saying they are fake. They're saying they don't "spin" just cause of the name of the company. That doesn't make sense. Why would you want your ear tips to spin? They tilt in all directions. Anyways...Second, I'm not being paid for saying good things about these. I saw these recommended from a thread on Reddit and researched them and bought them.First the packaging. Its simple, nothing amazing but its not boring. Explains how they work and all that. The ear tips are in plastic and then there's a cardboard material on the outside of it that covers the plastic. There is 4 ear tips (2 sets) in the box. The plastic is REALLY hard though. They protect the tips very well. They're just very hard to get out.The tips themselves aren't anything amazing to look at. The core is more magenta than pink.I got mine for the MeeAudio M6 Pro. These fit great. They were kinda hard to get on but they're not going anywhere. Since they tilt they can get into the ear better and it sounds better. The material is a lot softer than the stock ear tips. I really like the comply tips, but the ones that came with the M6 Pro are too big for my ears so they hurt after a bit. And a pack of comply tips cost $14-$20 and don't last that long.I got these for less than $10 and I will recommend them to anyone anytime. They're so much more comfy. They provide an amazing seal without sounding like a vacuum. The stock tips I was using sounded like a vacuum without doing a proper seal and eventually hurt my ears pretty bad. These made the ear pieces not sit in my ears so close so they were more comfortable.Basically, try them out. They're cheap. They're comfy. They move with your ears. Just make sure you know the right size. They make such a nice seal and you can hear the sound without it being in a vacuum.

After many months of searching for the perfect eartips to put on my various pairs of iems I can say without a doubt that the CP-100 lineup has been the most pleasant surprise from spinfit. For the first time in a long time an eartip gives a consistent, solid seal every time I place them in my ears, which is rare because I have massive ear canals. Gone is the stress of constantly jockeying with my iems to get the perfect seal, and worrying if they'll fall out or shift and break the seal.However, I do have problems with the sound signature these provide, especially when compared to my final audio type E's. When you put these on you do sacrifice some bass response for more treble, and that in and of itself isn't a problem, but the problem I had with them was sibilance. Dear God the sibilance. Many times when I would listen for a decently long period of time I noticed that S's in songs and high frequency stuff like cymbal crashes would freaking HURT. Like a really bad hiss in your ears for a split second, which was so disconcerting I would have to take them off. This took place on my campfire audio andromedas and atlases, and went away when I switched back to the type E's, so I'm fairly certain it does not come from the IEMs themselves.So, with all that being said, why 4 stars? Because I personally think that these are still great eartips, all things considered. They provide a wonderful, versatile fit, and I believe for most consumers that's more than good enough. The realization that you no longer have to worry or jockey your IEMs for the perfect seal is truly a joy to behold. So, if sibilance doesn't bother you than by all means, get these! If it does, then I highly suggest going for some Final Audio Type E eartips. They have a wide variety of sizes to chose from, and give an absolutely delicious bass response with a nice, rich, full sound profile. Also, no sibilance at all!