A few days ago I bought a pair of silicone sleeves, which was JVC's, and the name was a little evil, called the spiral pit silicone sleeve. The price is also very cheap, as long as six dollars, now I will test the effect of this silicone sleeve what?
Jvc ear earphone set universal spiral pit plug earphone silicone sleeve 6 yuan Lynx featured direct link appearance display 
A very small box. The packaging is also very simple.
There is a circle of pits inside the silicone sleeve. According to the official saying, these pits can diffuse the reflection control reverberation and make the sound cleaner.
JVC's cover is relatively short, and it is not very good to be installed on the IM03.
I compared it with some usual songs. 
Feeling JVC's sleeve, the bass is obviously better than the original, more cohesive feeling. Then the background accompaniment will be strengthened, and the overall space will have a reverberating feeling. This also makes IM03's voice a bit biased towards heavy tastes. In exchange for the earplugs of the original iron triangle, I feel that the sound has become fresh.
Seeing someone on the internet said to use the cover, there is no change in the sound, or less bass, but it may be due to the way of wearing.
In the right way, the sound will pass through the inner wall of the silicone sleeve and reach the ear. That means there will be more sound processing.
advantageCheap, six dollars you can not afford to lose, six dollars you can not be fooled.
The sound has indeed changed.
ShortcomingsSilicone sleeves are relatively short, and they can be difficult to see with long earplugs for catheters.
Ps
Because of concerns about the inappropriate size of the earbuds, I bought a box of MLsizes. Now it seems that the size of M is suitable for me. There is no background enthusiasts near Guomao, seeking to take away
Two mutually perpendicular reflecting surfaces are called ridge surfaces, and prisms with ridge surfaces are called ridge prisms.
The ridge prism is small in volume and can make the objective lens and eyepiece in a straight line, so it is often used for extremely compact binocular lens.
Roof Prism,Roof Penta Prism,Optical Roof Penta Prism,K9 Roof Prism
Hanzhong Hengpu Photoelectric Technology Co.,Ltd , https://www.hplenses.com