It is installed to protect the F-ring during circuit driving.
It is perfect in terms of performance and function. However, if you fall down with a lot of flair, it will be gone.
I have purchased it twice because I thought it could not be helped since it was originally just installed in the form of a sandwich.
Now we are wiring it to prevent it from being lost even if it comes off.
Looks like you access from European region.
Would you shop at webike.eu.com?

